Of course I claw. On a standard PSP, you cant effectively play MH with just camera centering. That gives you one look function, and thats only forward. That lets you have little to no control on planning and positioning your attacks. This is the reason Tri implemented the camera jump when you dodged, so that you can have better awareness at all times
I always clawed on my PSP, doesn't take long to get used to and it never hurt my finger like some people complained it did. Now I have a Vita though, clawing still works fine and I sometimes do it out of habit even though I can use the right stick to turn the camera
Ye--*sees picture* No. My thumb, like, never leaves the Circle Pad. if I needa press the arrow buttons, I take my index off of the L Button and go like that. Only do that for running around while keeping an eye on a boss, though.