Limiting discount codes 
In a previous event registration system I used, I could create coupon codes and then limit the number of times it could be used. The way that I used it was to create each of my sponsor companies their own code, and then limit it to however many discounts they were allowed (i.e. one level of sponsorship gets 2 free attendees to all events, so I would make the coupon be a 100% discount and limit it to being used twice).
Right now, it appears that you can do ONE coupon per registration level. I prefer not to do that for a few reasons, and the primary one being that I can't limit how many times it's used.
In the system I used previously, coupons were separate from events entirely. I'd create them all in one place, and then per event, I could check off which ones could be used. And coupons could be a $$ amount discount or a percentage.
This would be a really useful feature if Wild Apricot were able to add better coupon functioning.
That is exactly what we are thinking of - we have a number of requests about discounts and we realized that we want to build a central place to control all discounts.
Moving to wishlist.