I saw no 'bent disrespect, so I have no idea where that notion is coming from.
As explained to me after I asked a 'bent riding engineer what the OP is looking for, the tiller effect is having too long of an moment arm over the fork. This results in slow steering and makes control impossible. So for a long wheelbase 'bent, you can end up with a very slack head tube angle to make the moment arm shorter.
I think that if the OP actually drew up a design, even fuzzing over the crown area, he would find that pivoting the crown doesn't really get him what he wants. As Dave Kirk notes above, you are trading rake for axle to crown distance. And with a slack head tube angle, the moment on the crown is increased over road-like head angles.