Two commands, /plyBlacklist and /plyUnBlacklist.
Stable for the moment, a little messy but it works. This is primarily used to keep people from accessing default factions that don't use a whitelist, good for servers that have open factions but still want to be able to keep people out if need be.
Current bugs I know of:
1. Sometimes /plyUnblacklist will not work, in which case running the command a second time should work.