~/.config/youtube-dlg should just contain configuration files and not logs (which should go to $XDG_DATA_HOME/youtube-dlg/ ) nor youtube-dl binary (which should go to $XDG_CACHE_HOME).

Please also consider using appdirs instead of hardcoding ~/.config/

At least on Android (iOS does not yet implement the API), a PWA implementing the Share Target API would make submitting downloads much easier as YoutubeDL-Material could appear directly in the OS's share menu!

The Shortcuts plugin doesn't support all shortcuts available in Youtube music web interface.
I have found a nice summary of all shortcuts: https://support.google.com/youtubemusic/thread/180145?hl=en
(an alternative way is to press Shift+/ on the Youtube music web site to get the list of shortcuts).