MUC commands to change occupants' role and affiliation
** /kick <nick> <reason>
- /ban <nick> <reason>
- /voice <nick> <reason> (grant voice)
- /devoice <nick> <reason> (revoke voice) and so on... that's implemented in tkabber and that's very useful, especially with tab-completion; commands should be limited to what the user may actually do due to his privileges.