How to make Particle Playground systems keep going even when global time scale is set to 0.
Overwrite the SetTime function on line 1322 in PlaygroundC.cs to this:

		/// <summary>
		/// Updates the global time.
		/// </summary>
		public static void SetTime () {

			// Set time
			globalTime += (Time.realtimeSinceStartup-lastTimeUpdated)*globalTimescale;

			// Set delta time
			globalDeltaTime = globalTime-lastTimeUpdated;

			// Set interval stamp
			lastTimeUpdated = globalTime;
		}