Key Binding.
The ability to set up your own control scheme, or at the very least the choice to have the "start new match" and "finish turn" keys be different. This is mostly for editing SP replays, a lot of times you get stuck in a cycle of pressing the same few keys, but if you accidentally hit "p" when you shouldn't, and then hit space before you realize what happened, there goes that last 20 minutes of your ever shortening life D: