would be a problem for if there's more than 5 slots
Then how about this-
When the event is enabled and loaded during server setup, it scans all the playertypes, and looks for the one that has the highest inventory slot.
Then it set's it's slots to that.
If Chrono's Inventory slots mod(forgot the name) is enabled, and it's working, then the event sets it's parameters to that.
Or...
The event thing is set to 20/15 just to make sure.