A ban system would be nice but i could foresee a problem in that if they ban the degreaser the pyro is severely nerfed. This could be applied to most of the pyros weapons. Only sometimes does a pyro run a stock shotgun and still it is more a matter of preference. There would need to be a list of items that could not be banned like the degreaser, and stock weapons. The list of weapons that wouldn't be bannable would emerge over time after much testing.