diff --git a/Translations/default/menu.xml b/Translations/default/menu.xml
index 6bead6354..bb4779d36 100644
--- a/Translations/default/menu.xml
+++ b/Translations/default/menu.xml
@@ -7,7 +7,8 @@
 	<!-- File menu -->
 	<file>File</file>
 	<reset>Reset</reset>
-        <flight-recorder-control>Flight Recorder Control</flight-recorder-control>
+	<flight-recorder-control>Flight Recorder Control</flight-recorder-control>
+	<time-mode>Time Mode</time-mode>
 	<load-tape>Load Flight Recorder Tape</load-tape>
 	<save-tape>Save Flight Recorder Tape</save-tape>
 	<snap-shot>Screenshot</snap-shot>
diff --git a/gui/dialogs/lag-adjust.xml b/gui/dialogs/lag-adjust.xml
index 9cf9ba6cc..96cc8c686 100644
--- a/gui/dialogs/lag-adjust.xml
+++ b/gui/dialogs/lag-adjust.xml
@@ -49,6 +49,7 @@
             <halign>left</halign>
             <name>master</name>
             <property>/sim/multiplay/lag/master</property>
+            <live>true</live>
             <binding>
                 <command>dialog-apply</command>
                 <object-name>master</object-name>
diff --git a/gui/dialogs/time-mode.xml b/gui/dialogs/time-mode.xml
new file mode 100644
index 000000000..e947741f3
--- /dev/null
+++ b/gui/dialogs/time-mode.xml
@@ -0,0 +1,88 @@
+<?xml version="1.0"?>
+
+<PropertyList>
+
+    <name>time-mode</name>
+
+    <layout>vbox</layout>
+
+    <!-- titlebar -->
+    <group>
+        <layout>hbox</layout>
+        <empty>
+            <stretch>1</stretch>
+        </empty>
+
+        <text>
+            <label>Time Mode</label>
+        </text>
+
+        <empty>
+            <stretch>1</stretch>
+        </empty>
+
+        <button>
+            <pref-width>16</pref-width>
+            <pref-height>16</pref-height>
+            <legend></legend>
+            <keynum>27</keynum>
+            <border>2</border>
+            <binding>
+                <command>dialog-close</command>
+            </binding>
+        </button>
+    </group>
+
+    <hrule/>
+
+    <group>
+        <layout>vbox</layout>
+        <group>
+            <layout>hbox</layout>
+            <radio>
+                <halign>left</halign>
+                <label>Real time</label>
+                <property>/sim/multiplay/lag/master</property>
+                <live>true</live>
+                <binding>
+                    <command>dialog-apply</command>
+                </binding>
+                <binding>
+                    <command>nasal</command>
+                    <script>
+                        var v = props.globals.getNode("/sim/multiplay/lag/master").getBoolValue();
+                        if (v) {
+                            props.globals.getNode("/sim/time/simple-time/enabled", 1).setBoolValue(0);
+                        }
+                    </script>
+                </binding>
+            </radio>
+            <button>
+                <legend>Real time lag settings</legend>
+                <binding>
+                    <command>dialog-show</command>
+                    <dialog-name>lag-adjust</dialog-name>
+                </binding>
+            </button>
+        </group>
+        <radio>
+            <halign>left</halign>
+            <label>Simple time</label>
+            <property>/sim/time/simple-time/enabled</property>
+            <live>true</live>
+            <binding>
+                <command>dialog-apply</command>
+            </binding>
+            <binding>
+                <command>nasal</command>
+                <script>
+                    var v = props.globals.getNode("/sim/time/simple-time/enabled").getBoolValue();
+                    if (v) {
+                        props.globals.getNode("/sim/multiplay/lag/master", 1).setBoolValue(0);
+                    }
+                </script>
+            </binding>
+        </radio>
+    </group>
+
+</PropertyList>
diff --git a/gui/menubar.xml b/gui/menubar.xml
index a8a7c4b12..29985c6f9 100644
--- a/gui/menubar.xml
+++ b/gui/menubar.xml
@@ -20,6 +20,14 @@
 			</binding>
 		</item>
 
+		<item>
+			<name>time-mode</name>
+			<binding>
+				<command>dialog-show</command>
+				<dialog-name>time-mode</dialog-name>
+			</binding>
+		</item>
+
 		<item>
 			<name>snap-shot</name>
 			<key>F3</key>