RE: Nitro models pusher Bobcat?
There are benefits to not setting up the plane with a positive AOA while it's sitting on the gear...
If your noseleg is too long then the plane is far more inclined to bounce on a *fast* landing -- because it *will* touch down before the mains and thus force the nose to pitch up -- with resulting ballooning back into the air.
A shorter noseleg will ensure that once you touch-down, even if your landing speed isn't *perfect*, it will stick - because once the nose drops there will be no lift (or maybe even a little negative force).
If you can do a perfect two-pointer every time then a longer noseleg and rearward mains will work just fine -- but if you're an average flier (and especially if operating from tarmac) then the shorter noseleg and repositioned mains is a far safer option.
And, as for the prop-strike risk -- if you're worried about this, just put some wire anti-rotation legs on the bottom of your tailbooms so they limit the maximum AOA while on the ground -- I've seen plenty of (baby) boomerangs with these fitted and they don't even have a prop to strike :-)