Additional features? It already has so many, I can't think of much.
Does it already have a function to send something to the TP/AH?
If not: Say you buy a UB with the MSAB or AAA AB (If I remember right it does show the profit for the MSAB when you buy something), when the AB stops, instead of trying to price it with the rest of the shop, it has a couple buttons to allow you to send it to the TP or AH.
So when it's going through pricing, when it hits that item, instead of wasting pricing attempts, a tiny box pops up telling you that it's a UB and asking what you want to do with it. (Price, TP, AH, or nothing).
If sent to the TP/AH, could it do a quick search to find the going price from the TP/AH, and then show you a little box with the lowest price, that way you can price it accordingly. (If it doesn't have a price in the wishlist, is the only one on the TP, or isn't on the AH, the box would just tell you that it can't find a price for it).
This wouldn't really be a new program, but just a little addition to the shop AP it has.