People can only let their time run out (if they have lots left) so many times before running into the fair play policy.
You should only play rapid games if you don't want people to take a long time per move. If people have a long clock they are going to use it to examine all options and see what the right move is.
Actually, more time limit types to choose from would be a great way for folks to play the kinds of games they'd like and in many cases avoid the kinds of behaviours from their opponents that they'd like to avoid.
The same is true in turn-based where X moves per Y days or time-per-game controls have been proposed as a remedy for "vacation abuse".
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Can you please install a 5-minute time limit per move? I occasionally encounter players who simply refuse to move, and I must wait either forfeit or wait the entire remaining clock time. It is very annoying. Thanks.