[FR] Specify extra options

[notDavid]

Hi there,

Please consider to implement the possibility to specify "additional / custom yt-dlp parameters";

For example, I'm currently seeing some issues with the Jellyfin client when using Sponsorblock for some videos, and i'd like to add force-keyframes-at-cuts to that Source.

Simply having a text field to append some options, would be a good improvement.

Thank you!