The first thing that would help is having more + - options in higher numbers 50ms in most cases is to small and increase. Off ± 10, 5, 1 second options would help get closer easier, then dial in with the 50ms option.
The best feature would be the ability to PAUSE the video, then dial in the subtitles so can see what subtitles are being displayed based on what was just said in the paused video. Then play the video and tweet with 50ms options.
Right now the feature barely works and because it doesn’t have a hold option you have to click 100’s of times.
The experience is poor and hope Plex Dev can find away to get close while pauses, then minor tweaks. Find away to achieve this in the least amount of clicks would be the success metric for the feature.