Oh BTW - this is probably a well known thing but ... the Save and Export buttons are really confusing.

I think it's fair to assume that most users would expect the "Export" action to deal with writing out the scene to another format (like exporting to OBJ or FBX) ; yet the current export button is more of a "Save Selected". So why not simply call it just that ?

Basically having :
Save, Save As, Save Selected (for 3dm files) ; and also Export and Export selected (for all other formats).

Or even more simply :
Save, Save As, and Save selected (3dm + everything else), with no confusing mention of "export".

I hope this makes sense !