We run the B4/T4 at SRS twice a week with LiPo's... many of us do... they run amazing.. I dont see what needs to be redesigned.
I agree that ROAR should get with the times, but they haven't... So, I (and many people..) made the deceision to go with the superior technology, and not participate in races that don't allow them. Our state championship race allowed LiPo, as will the Cactus Classic (as it stands now).
If that makes me 'just' a club racer, then so be it.... I'm having more fun than in my previous 12 years of racing... and im still decently fast.