A feature that would be nice would be the ability to just delete a game instead of claiming a timeout.
In non-tournament games, I don't like claiming a timeout unless it is obvious that I am going to win. However, there are times where I feel my opponent has abandoned the game. I'd rather not artificially inflate my rating by claiming the win.
This feature should not apply to tournament games as you can't just delete games.
An interesting spin on this feature would be to offer a choice of claiming a win or draw.