Hi there,
When exporting a track for films (for instance), it is nearly always needed to deliver stems, but that doesn't mean each instrument should be delivered separately, as cello can be together with violins & violas, snares with bdrums & hihats, basses alone etc etc.
So my suggestion is : it would be great to be able to create (and name, of course) groups for instruments (kind of "create group" and "add instrument to group X", so that we can save an entire song with separate tracks for each group (cello+violin+viola in a group, for instance, all percs in another, basses in another etc).
So we would get a "save as groups" in addition to the current (useful too) "save as tracks or instruments".