I've been searching around to see if this feature has already been tackled, but I didn't find anything. It would be really cool if, for a reserved item, someone could choose to put themselves on the waitlist. Use case scenario as follows:
1. User browses to a piece of equipment they'd like to reserve.
2. They see it is already reserved for that time period.
3. They request to reserve in the event that the original reserver cancels.
4. They receive a notification via email if the original reserver cancels, and their order is now confirmed.