I have three needs that I'm going to have to code myself - would be nice if they were there:

1. A "give to a friend" referral coupon that results in a coupon back to the giver after the friend uses his coupon. I hope that makes sense. For example, someone orders from me. I ship with his order some coded $x-off coupons that aren't usable by him, but that he can give to friends. Once his friends use the coupons, his account is credited or I auto-email him a coupon code for $x-off his next order.

2. Coupons for $x or x% off a single item in an order. I'd like to distribute 50% off coupons but only have them apply to the lowest price item in an order.

3. My business model involves rentals, not sales, and I desperately need wish list / wait list functionality.