I have noticed that the arrow keys and space key have certain functionality when streaming to Chromecast, however I want to edit these if possible.
My problem is I have sync issues in some of my subtitles and I can correct the sync by keeping subtitle options open and leave the focus on subtitle sync inputbox by using up/down keys on keyboard. However, the up/down keys also affect volume and I haven't found a way to sync subtitles by keyboard without messing volume. I always need to do it with mouse and that's quite hard when I'm on couch, not in front of the computer. Any help is much appreciated. (it may even deal with .js file editing, I won't' mind :))