i think that you can add feature to lock rotation of several applications. When force rotation is enabled camera is of course rotating too (for me it's mainly problem of camera so if making tool to lock selected apps is needless i think nikolai can modify camera-ui2 to not rotateable even if force rotation is enabled - as function in settings for example).

Oh and second thing - the same way in photo view - rotating fullscreen photo is in conflict with cssu rotating

sorry if someone said it before but for me this problems are the biggest in portrait mode