A waitlist feature for events after registration closes or a max number of scouts is achieved would be nice, especially one that records the order they enter the list. Having a datetime stamp on it would be even better. In fact, having a datetime stamp on the signup for all attendees would be very handy, like this idea here:
Our troop uses the registration cutoff and the workaround is people send me emails that I have to sort through to figure out who I might be able to add later.