Being able to enable / disable the pan and tilt permission of the camera would be nice 

If the owner of the camera sets up motion detection for a particular zone and a friend pans and tilts the camera to a different position, the motion detection might not work properly because the camera will probably be looking at the wrong area.

Being able to share cameras with friends, family and neighbours is great, but it would be nice to have those users only view the camera in the position set by the owner.