Index: ps/trunk/binaries/data/mods/public/simulation/components/Timer.js
===================================================================
--- ps/trunk/binaries/data/mods/public/simulation/components/Timer.js
+++ ps/trunk/binaries/data/mods/public/simulation/components/Timer.js
@@ -73,6 +73,27 @@
 };
 
 /**
+ * Updates the repeat time of a timer.
+ * Note that this will take only effect after the next update.
+ *
+ * @param {number} timerID - The timer to update.
+ * @param {number} newRepeatTime - The new repeat time to use.
+ */
+Timer.prototype.UpdateRepeatTime = function(timerID, newRepeatTime)
+{
+	let timer = this.timers.get(timerID);
+	if (timer)
+		this.timers.set(timerID, {
+			"entity": timer.entity,
+			"iid": timer.iid,
+			"functionName": timer.functionName,
+			"time": timer.time,
+			"repeatTime": newRepeatTime,
+			"data": timer.data
+		});
+};
+
+/**
  * Cancels an existing timer that was created with SetTimeout/SetInterval.
  * @param {number} id - The timer's ID returned by either SetTimeout or SetInterval.
  */
Index: ps/trunk/binaries/data/mods/public/simulation/components/tests/test_Timer.js
===================================================================
--- ps/trunk/binaries/data/mods/public/simulation/components/tests/test_Timer.js
+++ ps/trunk/binaries/data/mods/public/simulation/components/tests/test_Timer.js
@@ -78,3 +78,20 @@
 
 cmpTimer.OnUpdate({ "turnLength": 3.0 });
 TS_ASSERT_UNEVAL_EQUALS(fired, [["s",2500]]);
+
+fired = [];
+let f = cmpTimer.SetInterval(10, IID_Test, "Callback", 1000, 1000, "f");
+
+cmpTimer.OnUpdate({ "turnLength": 1 });
+TS_ASSERT_UNEVAL_EQUALS(fired, [["f", 0]]);
+
+cmpTimer.OnUpdate({ "turnLength": 1 });
+TS_ASSERT_UNEVAL_EQUALS(fired, [["f", 0], ["f", 0]]);
+
+cmpTimer.UpdateRepeatTime(f, 500);
+cmpTimer.OnUpdate({ "turnLength": 1.5 });
+// Interval updated at next updated, so expecting latency here.
+TS_ASSERT_UNEVAL_EQUALS(fired, [["f", 0], ["f", 0], ["f", 500], ["f", 0]]);
+
+cmpTimer.OnUpdate({ "turnLength": 0.5 });
+TS_ASSERT_UNEVAL_EQUALS(fired, [["f", 0], ["f", 0], ["f", 500], ["f", 0], ["f", 0]]);