I kinda see where Tom's coming from with this. I was trying to do a manual line at our local ramp where you like pop out of the ramp, manual along the deck, hop up to backwheel onto the edge of the extension, then back into the ramp. On my BMX, it's a b*****d 'cos you've got to be *so* precise with it, just getting into it, but also 'cos you have to be able to apply pressure which will in effect be forcing the back wheel down as you hop. Anyway, on my BMX it's a mission just because I can't rely on ultra powerful brakes and knobbly, grippy tyres. Don't get me wrong - my BMX's brake is damn good, but it's not as good at holding as my Magura is. You HAVE to be accurate with it, and because of the nature of a lot of moves in skateparks/street/trails, it's balls out first time almost every time, whereas with trials with a lot of stuff you can work up to it a lot more easily...
I can't really answer though, 'cos I love riding my BMX now, but I still feel the urge to ride the T-Pro every now and again too...