You can already do this yourself, however it will be a cheat video and not in depth.
Sunday and near enough 11am (10:45) and just woke up
Give me a while for a coffee and I will try and jerry rig something.
I could not get the screen saver mode to trigger, however the cheat is just to set up a screen saver folder, copy the videos from CoinOps, as they have already done the hard work for you, just edit the script to either load from c:\screensaver or add artwork for a system called screensaver and then point to add_artwork_screensaver.
As for you knowing what widescreen is, congratulations, however when you are getting 16:9 backwards and saying 9:16 it is a bit confusing for other people to understand. I also have a vertical monitor, but I do not get confused and mix them up.
You can edit stuff like this to suit what you want if ( config["preserve_ar"] == "Yes" ) yes to no, true to false.
obj.preserve_aspect_ratio = true;
So what you want to do is already possible and doable, just needs someone to do it for you, or you do it yourself.
Regards
Mark