Hello,
It would be great to be able to use “nested projects” as clips in a project.
For example :
- you’re working on 10 tracks for an album, each in a different project
- you create one more project for the mastering inside of which you import the individual projects from each song
- they appear in your mastering project as clips and when you play them, their main output is read
- if you double-clic on any of them, the corresponding project is opened and activated
I know this might be a big feature but it’s also the most useful improvement I can think of (for me anyway).
Even with restrictions like not being able to overlap more than 2 nested sequences at any given time or not being able to edit the clip at all, it would still be an amazing feature.
I’ve been working a lot with Adobe Premiere for at least 10 years and the biggest improvement I’ve ever seen was when they allowed to use After Effects projects as clips directly in the timeline in Premiere. Any change you make in an After Effects project is immediately visible in your Premiere montage and it saves you a thousand round-trips of making any change in AE, rendering, importing, and so on, and so forth…
I hope one day (not too far) I could do the same kind of thing in Cubase, my favorite DAW since Cubase 3.7 (my God, I’m old! 
)