Yes that's perfectly fine, although there's not much point in 50episodes members doing it since it's already for scenes but the other three are fine with me.
If I were you I'd come up with a list of comms and then just add a line to the FAQ saying if there's a comm you'd like to use that isn't on the list ask the mod and then claim when you have his/her agreement. That way you have a core list and with any luck your members will keep adding to it without you having to do too much work.