-Changeable zoom/FOV, allowing for both far shots but also wide angle photos. preferably as a toggle-able slider but set buttons for wide angle, zoom and normal would be alright too
-Depending on camera rotation auto correct the saved picture
-A grid in the viewfinder, the usual rule of thirds would do the job
-Leveling tools so that the camera can be leveled with the push of a button
-Higher resolution output, 1080p is fine as is but a 4K resolution would make post processing work far easier to deal with
One more thing that could be added for the stream camera, when switching between pinned cameras have it be a smooth transition. Obviously give the user the option to toggle it and maybe even set the transition duration.