I can add a toggle in the settings to boost all videos volume. I had a person request per video boost switch in the feature menu.
Edit: on second thought I think I'll add a boost mode selection that will be global or per video
Edit 1: In version 1.18.0, I've introduced a Volume Boost Mode Selection feature. You can opt for 'Global' mode to boost all videos, or 'Per Video' mode for separate control. Try it out and share your thoughts!