Creating LRC: Add option for Reaction delay

[Extarys]

When pressing "Sync line & move next", the timestamps is on "click up", which is fine. But I noticed I then need to go line by line and remove 100-200 ms per line.

I usually do my LRC with gnome subtitle, then convert the SRT to LRC with a python script. Gnome Subtitle have a Reaction delay offset we can apply in the options:

If I click up at 00:01.50, this will record it at 00:01.30 and tend to make better synced lyrics :) I only publish when I'm 100% certain everything is 100% perfect, this would make it so I won't hesitate as much before publishing.