Setting for rotation lock
When I have rotation lock enabled on my device, VLC keeps the video in portrait mode when rotating the phone. Other players (e.g. PlayerXtreme) allow users to override the rotation lock and have the video always rotated to landscape mode (i.e. fullscreen) even when the phone is locked to portrait mode.
This would allow me to keep rotation lock enabled (useful for reading in bed) all the time, without having to switch it off when I want to watch a video in VLC.