Since moderation commands are implemented per-protocol in libpurple
(with no easy way to use with the catch-all IM_ROOM_BAN_PARTICIPANT
message and corresponding command), the PERM_BAN, PERM_KICK, and a
couple other moderative perms aren't afforded to the user, disabling
these non-functional options in the UI.
The commands can still be implemented by the libpurple plugin, though.
If they aren't, purple will complain with some error message.
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