According to our latest poll at the facebook page most people will be playing Imagine Earth with mouse and keyboard even though we have implemented an interesting solution for the xbox360-gamepad. But so we also developed a set of hotkeys, that will boost planetbuilding!
The universal ringkeys will enable you to access any tool or construct with the combination of not more than 1 or 2 keys. Press W and then E and you have immediately placed a citydistrict. If you are hovering a field with a building then the keys direct to the tools in there Q or A start upgrades while for example will start a repair D.