Hello Matt, hello Eric.
I totally understand this from a users perspective - but - can't stop thinking as a consultant (and that's my daily job).
So if you prepare studios, the "way back" from an isolated model set is very easy.
Maybe KeyShot can ask in an extra list of model sets, which model set should get the new geometry (all, active, selected)?!
That should help a lot!
So we can hope for a new release with this feature.
Cheers
Marco