I recently had a game in which I made an undo request. My opponent eventually asked what it was for, and I explained. This discussion went on long enough that apparently they were able to force my resignation. I had expected that this time would be my opponent's and not mine, similar to if I was waiting for them to react to one of my cards. As the game is in a state in which either of us could do something (I could cancel, my opponent could grant or decline), couldn't the timer be paused?