Auto-cancel pre-moves when they're supposed to take a piece and said piece instead moves away on the opponents turn. That way you can avoid blundering pieces AND the game. Losing like this is seriously annoying.
Amazing idea! But we need that backed by an integrated AI which cancels your auto-cancel if we have less than say 3 seconds on the clock or it worsens your position too much. It would be seriously annoying to lose on time because your premove was auto-cancelled.