But I love portrait mode on other applications. It's just that the camera is not usable if it flips, only one quarter of the screen can be viewed (can't take portrait shots).

Typically, one would need to open lens cover, close camera app, lock landscape orientation, open camera app, which is a long process..
Also if you have Almost TI calculator, it rotates so you can only see half of the screen and flickers like it's having a seisure.

An awesome new addition would be to be able to disable autorotation for the Camera and Almost TI calculator