It's an interesting suggestion which may work, but I do see where it could be used in the wrong way.

Rule #2. Maximum time for total games.

Well there are some people who sign in every day, and maybe play for an hour. Well if I wanted to be stinky, I could figure out that they are on from 7pm-8pm every day - and wait until 8:01 to make my move where they would have 23 hours taken off their timer before they were to move again. After doing this for a week, it could look like they move slow even though they play their games every day. (Again, just an extreme example of how that rule could be used wrongly.)