[patzzz]

I'll think about it.

Edit:
For seasons it would be enough to output the seasons + plot of each single one? I don't want to create another dialog for this rare cases.

It isn't necessary to create another dialog or show the plot of each season, only show the images of each season and when you click in one it'll show the information with plot, cast, trailer, crew, etc. using script-embuary-video.xml.

Really it's the same functionality like "Similar titles", but returning Seasons or Movies in a Set and the List control ID could be shared between both as ExtendedInfo does.
Just add a new ID to script-embuary-video.xml that returns clickable images with Seasons and Movies in a Set as with the Similar titles.