[ashlar]

For the "Version" dialog got cancelled but play continued, this is by design. The consideration for this is, user already chose paly a movie, that's their intention. So no matter what they've chosen in the "Version" dialog, Kodi should play one, just like there is no this "Version" dialog. If user choose a different version than default, Kodi play that version, otherwise, just play the default version.

Read everything else and I will experiment with renaming. Not having tried yet, just by reading your description, I fear this might be too convoluted. So maybe there could be a way to have a Rename button somewhere in the interface. But before getting back on this I need to experiment a little. Maybe doing is easier than reading.

On the above, though, I am pretty sure it sort of violates one core tenet of the overall Kodi interface. As long as you're still in a menu, there is a way to go back. The default value, when set, makes you play a specific version of a movie (which you beforehand set as default, right?). If the user hasn't selected a specific default, I wouldn't assume anything.

At the end of the day, this "nesting" of movies is similar to Movie Sets. When I enter a Movie Set I can exit it and I expect to be able to do it when I enter Movie Versions.

I don't know if it comes from the programming side of it, but the overall idea of a "default/base/standard" version needing to exist once a user has created a Movie Versions group... what practical results does it provide? It seems to be generating more headaches for you than anything. :-)

The above is obviously just the way I see it. I'm sure others will chime in and maybe my view will not be that of the majority. :-)
But if I'm right about the "core tenet of the interface", then maybe it'll need to change.

Keep up the good work. This is looking incredibly promising. Thank you!