suggestion for troll control in often attacked forums

i had an idea i beieve is worth discussing (any mod whod like to add a poll feel free)
many groups like to target hipforums with troll attacks, wether its anti gay or anti hippy or pro gun or even nambla and others
i'd like to see in highly attacked forums like the hippy and gay forums especialy to see senior members given the option to give guests a 4 hour or so temp ban priveledge thats submitted to supermods to review and decide on a full ban..
this way all regular users of those forums can instantly end and deal with atacks until mods can get to them.

ofcourse this would need to have user responcibility built in.. as in would need to make sure its only used to combat actual trolls.
and not just to shut up someone you dont like or agree with.. so perhaps the supermods would have the option for a short ban for inapropriately using this option
ithink it should only be in those forums that are attacked often however
might also just change the report bad post to not exactly a ban, but a temporary suspention of posting priveledge until its reviewed by a mod?
cause i know sometimes that can take awhile to get to them..