For now there are only a few things that come to mind: -The first being a way for a Kerbal on EVA to transmit a science report without having to reenter the craft. It can be a small radio in the helmet that transmits back to the ship and is relayed or something. -Another would be choosing different versions of the tech tree (classic, historical, etc.), I know mods do this but none help with flight before space gameplay (aircraft). -And the last (I know am am asking a lot here), a update to the physics of spaceplanes so they handle better and don't have to fly at 30 degree angles just to maintain their altitude. That is all I have for now, if I think of anything else I will let you know.