I'm not really sure if this has been brought up before, But it really sucks when you get down to a single digit amount of energy. You seriously can't do anything, But sit and wait for some small amount to regenerate. D:
Could we have some sort of fix for this?
I'm not really sure if you have noticed, but that's the whole point behind the Energy system. The whole game is free to play. The only "limiting" factor is energy. You can however buy more with in-game coins (Crowns), so 100% free play is possible.
As a side-note, try playing the game only until your energy is gone, and then leave your computer be for a day! If you spend your energy wisely, you'll only be playing a "healthy" amount of computer games a day ;)