I don’t know if this is welcome here, but I wrote a little Tampermonkey script to add some functionality to watch2gether.
It includes renaming direct video URLs (if you host the sync server yourself), as well as buttons to skip to the top or bottom of a playlist (useful for long playlists).
Tampermonkey script: w2g-tools-sync/w2g-tools-client.js at master · aequabit/w2g-tools-sync · GitHub
Repository: GitHub - aequabit/w2g-tools-sync
(can only put 2 urls in a post and can’t embed media)