One of the things that people complain about hoppers is that they take donated troops with them once they leave. So why not lock troops donated to clan? So once they leave troops are automatically flushed, I think by this hopper's CC will still have the request option lock for the amount of time you decide or keep the same amount you have right now. For the donator everything would stay the same but would be a bit happier knowing troops he/she donated are not stolen.

