Memory leaks are caused by not closing registrations (event reg refnums) rather than user event refnums. If nothing is registered, you can generate your events 'till your hearts content and you won't leak memory.That's why you can have plugins that come in and out of memory and attach to existing events.
Besides. When I exit, I want all memory cleared up including any leaks and LabVIEW takes care of that. When the app is running, I generally want all events running too and let whatever needs them regsiter and unregister..