Been playing underground empires for a while now and thought about three things that would make excavation mechanics a little more fluid:
1 - A hotkey for the excavation tool. Having to click the shovel everytime is horrible (especially for people like me, that have RSI);
2 - A toggle (on/off) option to see the dig sites without having to hit the excavation tool;
3 - Make "Esc" prioritize canceling the dig action before opening the game menu (this would be nice for spells too).
Don't know how difficult would be to implement these things, but i'm pretty sure they'd be a great improvement for the game.