[Calahan]

If you do accidentally hit the e-key in SP games, then one option to undo it is to shut the program down before the turn has finished processing. This then has the effect of turning 'end turn' into 'save and exit'. As a new .trn file isn't created until the turn has finished processing, and restarting the program and selcting 'continue where you left off', should take you right back to the moment when you had the accident.

Shutting Dominions down before the turn has processed should be easy once any real battles are taking place, as processing takes a fair bit of time regradless of your rig. And it's even easier if you play in windowed mode, as you just have to hit a single button.