I want is a feature to type in the amount you want to sell of something, instead of clicking over and over again. As far as I can tell I haven't found this, or at least it's not as noticeable as it should, if there at all. This goes for AH, Trades, and even selling to vendors (stuff like cores, gel drops, scrap metals, etc.) and minerals. Minerals mainly because people that actually want to try and change gates generally save them up and only sell one or two types at a time, and it can take a while if you've got a big amount. It's not a major problem, but for such a simple feature to be added, it would save some time and help for the convenience of players.