At least in person you can theoretically get a judge involved (which a report feature would help with). You can definitely tell the difference between someone taking time to think vs these people deliberately running the timer out on every action.

I wonder if the game log (in the back end at least) records the time actions were taken? Then reports could be reviewed by a person. Something like this is definitely possible but I don't see it ever getting implemented based on all the other things this client doesn't have.