I noticed a couple of other things regarding the T-Code implementation. It seems that sometimes the range of the slider isn't saved correctly. For example if you have it at 60 when opening a video, change it to something else like 80, quit the video and then play it again, it's back to 60.
Sometimes the slider doesn't seem to do anything either. My OSR2+ just keeps moving at the same range. Restarting the video usually fixes it.
I also experienced that bringing up the menu while playing a video can pause the movement of my OSR2+ in some cases. The only way to fix this is by restarting DeoVR. This happens rarely though and I don't know how to reproduce it.
I'm using Air Link to stream DeoVR to my pc using a prebuild OSR2+ from FunOSR.