Leave Channel Permission

it would be good to have an option that ensures that a invited user stays within the channel he was invited for. So a kind of a "Leave Channel Permission" that can be set to deny.

The even better solution would be a function that puts all new users who are entering a channel automatically to a defined permission group. Or: Defining a permission group to the invite. So that all users who are using this invite are automatically added to a predefined permission group.

regards