diff --git a/VisualPinball.Unity/VisualPinball.Unity.Test/Diagnostics/LoggingTests.cs b/VisualPinball.Unity/VisualPinball.Unity.Test/Diagnostics/LoggingTests.cs
index b302273f7..b45826c7c 100644
--- a/VisualPinball.Unity/VisualPinball.Unity.Test/Diagnostics/LoggingTests.cs
+++ b/VisualPinball.Unity/VisualPinball.Unity.Test/Diagnostics/LoggingTests.cs
@@ -24,6 +24,7 @@
 using NUnit.Framework;
 using UnityEngine;
 using UnityEngine.TestTools;
+using VisualPinball.Unity.Simulation;
 
 namespace VisualPinball.Unity.Test
 {
@@ -153,6 +154,8 @@ public void ShouldThrottleOncePerKeyBeyondTheKeyLimit()
 		}
 
 		[TestCase(new[] { "-vpe-log-level=debug" }, "Debug")]
+		[TestCase(new[] { "--vpe-log-level=debug" }, "Debug")]
+		[TestCase(new[] { "player.exe", "--vpe-log-level", "warn" }, "Warn")]
 		[TestCase(new[] { "player.exe", "-vpe-log-level", "trace" }, "Trace")]
 		[TestCase(new[] { "-VPE-LOG-LEVEL=Warning" }, "Warn")]
 		[TestCase(new[] { "-vpe-log-level" }, null)]
@@ -164,6 +167,19 @@ public void ShouldParseTheLevelFromTheCommandLine(string[] args, string expected
 			(VpeLog.ParseCommandLineLevel(args)?.Name).Should().Be(expected);
 		}
 
+		[TestCase(new[] { "player.exe", "--simulation-trace" }, true)]
+		[TestCase(new[] { "player.exe", "-simulation-trace" }, true)]
+		[TestCase(new[] { "--no-simulation-trace" }, false)]
+		[TestCase(new[] { "-NO-SIMULATION-TRACE" }, false)]
+		[TestCase(new[] { "--simulation-trace", "--no-simulation-trace" }, false)]
+		[TestCase(new[] { "-no-simulation-trace", "-simulation-trace" }, true)]
+		[TestCase(new[] { "player.exe", "--simulation-tracex", "---simulation-trace" }, null)]
+		[TestCase(new string[0], null)]
+		public void ShouldParseTheSimulationTraceSwitch(string[] args, bool? expected)
+		{
+			SimulationTrace.ParseCommandLineOverride(args).Should().Be(expected);
+		}
+
 		[Test]
 		public void ShouldKeepTheNewestLinesWithinTheBudget()
 		{
diff --git a/VisualPinball.Unity/VisualPinball.Unity/Diagnostics/SystemSpecs.cs b/VisualPinball.Unity/VisualPinball.Unity/Diagnostics/SystemSpecs.cs
index 63cdaf645..74e63c772 100644
--- a/VisualPinball.Unity/VisualPinball.Unity/Diagnostics/SystemSpecs.cs
+++ b/VisualPinball.Unity/VisualPinball.Unity/Diagnostics/SystemSpecs.cs
@@ -91,7 +91,7 @@ internal static string CommandLine(IReadOnlyList<string> args, bool editor)
 			for (var i = 0; i < args.Count; i++) {
 				var arg = args[i];
 				var isOption = arg.StartsWith("-");
-				if (editor && !(isOption && arg.StartsWith("-vpe", StringComparison.OrdinalIgnoreCase))) {
+				if (editor && !(isOption && arg.TrimStart('-').StartsWith("vpe", StringComparison.OrdinalIgnoreCase))) {
 					continue;
 				}
 				var equals = arg.IndexOf('=');
diff --git a/VisualPinball.Unity/VisualPinball.Unity/Diagnostics/VpeLog.cs b/VisualPinball.Unity/VisualPinball.Unity/Diagnostics/VpeLog.cs
index 0ab00378a..d517efd4d 100644
--- a/VisualPinball.Unity/VisualPinball.Unity/Diagnostics/VpeLog.cs
+++ b/VisualPinball.Unity/VisualPinball.Unity/Diagnostics/VpeLog.cs
@@ -248,7 +248,7 @@ private static void PublishSessionDiagnostics()
 		/// <param name="logDirectory">Folder for session log files. Logging to a file
 		/// starts with this call; lines logged before it are copied from the tail. An
 		/// empty string stops logging to a file.</param>
-		/// <param name="level">Lowest level to log. The <c>-vpe-log-level</c> command
+		/// <param name="level">Lowest level to log. The <c>--vpe-log-level</c> command
 		/// line argument overrides it.</param>
 		public static void Configure(string logDirectory = null, LogLevel level = null)
 		{
@@ -489,7 +489,7 @@ public static LogLevel ParseLevel(string name)
 		}
 
 		/// <summary>
-		/// Reads <c>-vpe-log-level=debug</c> or <c>-vpe-log-level debug</c>.
+		/// Reads <c>--vpe-log-level=debug</c> or <c>--vpe-log-level debug</c> (one dash works too).
 		/// </summary>
 		public static LogLevel ParseCommandLineLevel(IReadOnlyList<string> args)
 		{
@@ -498,6 +498,10 @@ public static LogLevel ParseCommandLineLevel(IReadOnlyList<string> args)
 			}
 			for (var i = 0; i < args.Count; i++) {
 				var arg = args[i];
+				// --name is the documented form, -name still works
+				if (arg != null && arg.StartsWith("--", StringComparison.Ordinal)) {
+					arg = arg.Substring(1);
+				}
 				if (arg == null || !arg.StartsWith(LevelArgument, StringComparison.OrdinalIgnoreCase)) {
 					continue;
 				}
diff --git a/VisualPinball.Unity/VisualPinball.Unity/Game/Engine/GamelogicPaths.cs b/VisualPinball.Unity/VisualPinball.Unity/Game/Engine/GamelogicPaths.cs
index 1e23d06f7..74345d458 100644
--- a/VisualPinball.Unity/VisualPinball.Unity/Game/Engine/GamelogicPaths.cs
+++ b/VisualPinball.Unity/VisualPinball.Unity/Game/Engine/GamelogicPaths.cs
@@ -58,6 +58,23 @@ public static string RomFolderOverride
 		private static string _hostRomFolder;
 		private static string _romFolderOverride;
 
+		/// <summary>
+		/// A gamelogic engine couldn't find the ROM the table needs. Raised on the main thread with
+		/// the ROM's name and the folder(s) that were searched, so the host can ask for the ROM
+		/// folder.
+		/// </summary>
+		public static event Action<string, string> RomMissing;
+
+		/// <summary>
+		/// Called by a gamelogic engine on the main thread when the table's ROM isn't there.
+		/// </summary>
+		/// <param name="rom">Name of the ROM, e.g. <c>t2_l8</c></param>
+		/// <param name="searchedFolders">The ';'-separated folders it looked in, or null</param>
+		public static void ReportRomMissing(string rom, string searchedFolders)
+		{
+			RomMissing?.Invoke(rom, searchedFolders);
+		}
+
 		/// <summary>
 		/// The root of VPE's own data on this machine (<c>%LOCALAPPDATA%\Visual Pinball Engine</c>
 		/// on Windows), shared by all VPE apps. Gamelogic engines keep their data in a sub folder.
@@ -90,6 +107,7 @@ public static string NormalizeFolderList(string folders)
 		private static void ResetPlaySession()
 		{
 			_romFolderOverride = null;
+			RomMissing = null;
 		}
 	}
 }
diff --git a/VisualPinball.Unity/VisualPinball.Unity/Simulation/SimulationTrace.cs b/VisualPinball.Unity/VisualPinball.Unity/Simulation/SimulationTrace.cs
index 3374b68d4..a186e89bf 100644
--- a/VisualPinball.Unity/VisualPinball.Unity/Simulation/SimulationTrace.cs
+++ b/VisualPinball.Unity/VisualPinball.Unity/Simulation/SimulationTrace.cs
@@ -5,6 +5,7 @@
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 using System;
+using System.Collections.Generic;
 using System.Diagnostics;
 using System.Globalization;
 using System.IO;
@@ -215,13 +216,23 @@ public void Dispose()
 		private static long _beginUsec;
 
 		/// <summary>
-		/// Command-line override for player builds: <c>-simulation-trace</c> records,
-		/// <c>-no-simulation-trace</c> does not. Null when neither is given.
+		/// Command-line override for player builds: <c>--simulation-trace</c> records,
+		/// <c>--no-simulation-trace</c> does not (one dash works too). Null when neither is given.
 		/// </summary>
-		public static bool? CommandLineOverride()
+		public static bool? CommandLineOverride() => ParseCommandLineOverride(Environment.GetCommandLineArgs());
+
+		/// <summary>
+		/// <see cref="CommandLineOverride"/> for given arguments. The last switch wins.
+		/// </summary>
+		public static bool? ParseCommandLineOverride(IReadOnlyList<string> args)
 		{
 			var result = (bool?)null;
-			foreach (var arg in Environment.GetCommandLineArgs()) {
+			if (args == null) {
+				return null;
+			}
+			foreach (var raw in args) {
+				// --name is the documented form, -name still works
+				var arg = raw.StartsWith("--", StringComparison.Ordinal) ? raw.Substring(1) : raw;
 				if (string.Equals(arg, "-simulation-trace", StringComparison.OrdinalIgnoreCase)) {
 					result = true;
 				} else if (string.Equals(arg, "-no-simulation-trace", StringComparison.OrdinalIgnoreCase)) {