This is going to sound really petty. 

I am using a tablet, and often I will select the wrong things when playing this site due to my crappy touchscreen and the small buttons. This hasn't been a huge issue until today, when I accidentally selected "reroll" instead of "view current defensive roll" on the Battlefield. I didn't want to change my roll, so I let the timer run out, and now I'll have to wait another ten hours for my energy to regenerate before I do anything else. 

So, I guess I wish there was some way to cancel battlefield actions or be asked for confirmation or something. The game does ask for confirmation upon leaving the Battlefield, and perhaps it would be tedious to add it to attacks and rerolls, so maybe a cancel button would be a better way to go, although it would only be available before you made your first roll. I don't really know, some system of that sort; I'm just a little bugged at having lost my turn. 

I would really like a "Are you sure you want to re-roll" pop up. I am always paranoid when I have the perfect tactics set up that I will accidently hit re-roll and my luck will decide to give me crap tactics and there goes my team's chances to stay in their position.