In case of flooding jerks, use this (quiet the unregistered):
/mode +q $~a
In case of many sock puppet jerks join-flooding, use this (only registered users can join):
In case of no jerks, use these:
/mode -rq $~a
quiet - like
+bbut instead of banning, it silences.
registered - restricts joining to registered users.
+b instead of regular