I don't really mean to sound like a dick, but most of the things people are asking for in this forum are completely useless. Keyboard, mouse functionality? Keyboard and mouse functionality is flawless, there's no reason to add useless "features". Multiplayer is awesome and MUCH easier than any other engine, it'd be nice if they didn't add more to it and kept it as simple as it is right now, because in it's current state, making a multiplayer game takes less than 10 minutes.
People have made some good points when it comes to project construction and organization within the IDE as a whole, but when it comes to plugin expansion that's not incredibly ridiculously nitpicky, official Steam, Gamejolt, etc support would be great. Support for the platforms we will be developing for from the very beginning, in other words.