There are two pretty simple things i would love to see added to the standard feature set of the markets.
1) The ability to release escrow in various amount like 1/4 1/2 3/4 4/4. This adds a lot of nice flexibility for both vendors and buyers. For example sometimes id like to give my favorite vendors money up front while still keeping some money in my control as an incentive. This feature worked well on cloud 9 already if i believe before it went down.
2) I think it would be nice if vendor feedback was broken up into two distinct sections. One to be updated immediately once the product is received and covers shipping stealth speed ect. The other is to cover QUALITY once the product has been consumed and should be written a week or two later. All the feedback i ever see says something along the lines of "haven't had a chance to test product yet". I really wish that would change. IMO the reviews are one of the nicest aspect of the markets.
Those are my thought in the hopes that some market admin might get something useful out of them (im looking at you BB i know agora isn't gonna listen)
I like feature 1 a lot.
Feedback also needs a serious overhaul to help out buyers, vendors, and prospective buyers.