About the two parameters:
For Spawn Starting Event Id, this parameter allows for the spawner to start spawning events at a specific ID such that the spawner has its own space to work without interfering with other events, just a clean workspace for the spawner so that you know any events spawned after this number is a spawned event. I defaulted this to 1000. Basically when you spawn your first event its id will be 1000, then the next event will be 1001, then 1002 etc. etc. Now when you unspawn one of these events that eventId will be reused on your next spawn unless that event was saved, if the event was saved then that unspawned event remains in the queue waiting to be respawned, thus an extra event remains on the map. To restore an unspawned event which was saved you need to use Ritter.restoreUnspawnedEvent(eventId). Restoring unspawned saved events can be rather tricky to figure out at first though, its something I intended to expand on to make easier but haven't gotten around to it yet. If you're using thousands of saved events it would likely take quite a bit of reworking the spawner code to handle that really well and would likely need to reuse events which wouldn't preserve their original event ids.
As for the Chrono Engine Tool Event Offset parameter this was implemented because in my testing i found that tool events (when you attack) could sometimes steal some event properties from the final event on your event list. In some cases this interfered with gameplay in a game i'm developing so i created an offset to allow for a null/undefined event to be the final event in the list at all times, this made it so that tool events were allowed to operate unobstructed without grabbing properties from an event which is unintended. I defaulted this to 2000 because you should never have that many events on the map anyway thus event 2000 will be undefined and have no properties to steal. I'm not 100% sure why this happens with those tool events but this was the easiest way to correct the issue. :]
So in short just set the first spawn id parameter to a large number, and the chrono engine offset number to a much larger number.
Also the demo is coming along well and should be ready soon-ish. Trying to make sure I include enough in the demo to be a useful tool to pull ideas from :]