As one of the list administrators, I already have the *power* to ban posters or put them on the naughty list (i.e., the "I have to read it before deciding whether to pass it on" list).
I don't have the *authority* do to this, though. So I don't even consider doing so.
This is just like my status as a "developer", which gives me the *power* -- but not the *authority* -- to ban any user from Wikipedia or promote or demote sysops.
Ahh, the responsible exercise of power: how difficult it is! Yet, how essential!
Ed Poor wikiEN-l administrator & Wikipedia developer & Wikipedia sysop