even then, i think a major reason rotation is so touchy on the n900 is because of its multitasking, when you go into to the task switcher, you can see that it has to rotate every single application that's open!

i think i would prefer PB-rotation, over "proper" rotation, as i'm sure it would give the cpu a bit of a break, as it wouldn't have to check when it was being rotated, it could just do what it's meant to do, and leave the orientation to the professionals :P

and how often do you use that menu vs. how often you want it to rotate?
either way it should definitely be user-definable!