I just want a button that rewinds 10-15s, turns on subtitles, and then turns them off when it catches up again. It's a pattern I do manually with some regularity.
I suppose with Jellyfin/OSS, this is something I could implement myself if I was so inclined...
Most of the apps on Roku have a 10 second rewind and you can set subtitles/CC to be on resume which means they only stick around for about 10 seconds or so.
I can't have full-time subs, I can't read and pay attention to the show at the same time, even though I can read fast. I just impulsively read the subtitle over again.