Is it really that bad? I haven't played since the GUI update but was thinking about getting into it again because I still have years of muscle memory from it. But if I am forced to use the mouse im not sure I even want to bother. There is absolutely no way I could play the game at the same speed I use to if I have to resort to mouse-only features.
IMO, the steam release is not very good. Especially if you had been used to using the top mods that existed before the steam release for ease of control.