It would be nice to have the Events Module Promotion Codes act like the Discount Codes in Team Raiser where you build out the % or $ off and then associate it with the type rather than building One Registration Type per Promo Code and then having that many times special URL's. 

Example - I have an event that needs 1 Registration type, but has already asked for 20+ discount types since some are "Free" based on Company Sponsoring, some are % off due to time of registering, ect. Now i have to build the one Reg. Type 20+ times and have 20+ URLs for folks to register. 

Seems a little caveman like since in Team Raiser you can build what you need and associate with and no extra URL needed.