I ran a couple of PTRA 7.0 class (.400 Pro Tree, deep staging ok) a couple years ago, and won the 2nd race out, footbraking my Stocker. Ok, so it was only a 2 round race, but I won!
(Then they put the classes together in a handicapped Pro Tree bracket style deal, and made it to the semis with a broken rear!)
Bottom line, like others said, doesn't matter *how* you do it (R/T or ET), as long as you *can* do it.