We, all together, make a bitcointalk forum. The voice of the community should have an impact. Staff and admins cannot exist without us just as we cannot exist without them.
Maybe it would be a good idea to organize some kind of petition? If enough people agree with this idea, maybe the forum administrators will react and introduce some kind of rule or restriction for bounty campaign organizers.
I'm convinced you'd have more luck taking your request direct to the campaign you'd like to join. Granted, it's rare for the applicant to dictate terms to the potential employer. As an analogy, if you work certain places at an entry-level position, maybe you're required to wear the company uniform. If you think you're good enough that you can ask them to make an exception and still get the job, give it a try. But you better be confident you've got something to offer above and beyond what others are able to contribute. Otherwise they might just give the job to someone who doesn't complain. This forum isn't exactly short on available workforce. It's up to you whether to risk it or not.
Still, I think your chances are better with that approach, rather than trying to change forum rules.
Also, consider the remote possibility that you were successful in getting the rules changed and what that might mean for all the campaign managers who would have to suddenly change their practices. If you effectively force their hand, some of them might not take kindly to that. It's conceivable that it might even harm your chances of getting accepted to a campaign if they believe you've brought any financial harm to their business model by bringing about the forum equivalent of regulatory hurdles and red tape. Careful what you wish for and such.