Using FFMPEG the video pauses when going fullscreen in LB, you have to click once to get the play button to show then click again to play the video, WMP works as intended.
No there isn't, i requested the feature but there wasn't any interest.
https://feedback.launchbox.gg/p/separate-video-priorities-in-launchbox-and-bigbox
Do you have Send F11 in your running script? Because i've been trying to get Citra to launch fullscreen but it was only doing it every other time. The F11 was turning fullscreen on when i exited and then off again the next time i exited.