There’s always been the ability to “zoom with rubber” in the Montage across multiple tracks/clips (which I’ve never really made use of). But what would really be useful for me would be “select clips with rubber” that could do the same thing, but which would select all clips that intersect the rubber, across multiple tracks/clips.
I have a lot of DVD montages with 6 or 8 mono tracks, and trying to manipulate the clips (fades, xfades, splits, inserts, deletions) in just the first 6 tracks or just the last 2 tracks is extremely difficult, even with Grouping (which goes away when you split across all tracks).
“Select clips under rubber” would be an ideal solution for me (better than grouping, even if grouping could retain the groups after split). And I think it would make it easier to deal with instances where I have just a stereo track, but a clip or clips with lots of small splices that I want to select all at once.