Outstanding idea and really appreciated keeping the server interesting.
Just adding some more thoughts here. It would seem to me that PFF is just as intrinsic to a bubble defender or controller, as hibernate is to an ice tanker. I know that my bubblers use it very often during missions (more so than the ice tankers I've teamed with use Hibernate)
I agree that the contest would never end if players are allowed to use these powers, or a combination of them. They could chain a number of them together with enough recharge enhancements (via Hasten and IO sets) to stay pretty much untouchable for extended periods of time.
Heck, just the invisibility toggle power (pool power) would be sufficient to stay untouchable the whole time. It's against the rules to attack so the invisibility would never break. I suppose they might get slapped a bit by AE though so Inviso might not be so great (depends on if someone is standing near them).
Sorry to say but it's a great idea but needs a lot more work before you can run with it. In the end if you cancel all powers such as PFF, Inviso, Hibernate, etc... Tanks will win. They have more resistance and hitpoints. It's pretty much boils down to that.
P.S. after some thought you might change your stance on attacking. If contestants were required to attack (be it simply brawl) every once in a while (say once a minute or so)... the question of all of these powers would be moot. Sure they can bubble or hibernate but they have to come out once in a while to stay within the rules. They couldn't stay untouchable forever, which is what would happen if they didn't have to attack.
It's a thought....
Oh and PSS... I see the birthday icon for Lady Dee. Happy Birthday! Please don't get discouraged that some of us or poking at your wonderful idea. For my part it's just to help make a great idea even better and participate in community events.