Hello Mark,

I think that user (owner of the listing) have to decide wants he related video or not.

When you get embed from YouTube, there is the checkbox 'Include related videos longitude', so i think it's not a problem for the user to hide related video.
I do not know was there the function or not, maybe it's recently added..

By the way.
We do not support the YouTube plugin more because we have the youtube function built in the version (add video page)
Anyway thank you for the information, i did not know about it before.

Maybe your idea is for administration of websites?
e.g. Admin wants to disable youtube related video anywhere on his website?