What I always wanted from Rhino was the possibility to edit groups similar to those in Adobe Illustrator. Meaning, you can “enter” the group by double clicking, and then work within the group while the rest of the geometry is grey and cannot be edited. It’s a lot easier in Illustrator to work with groups, but having groups overarching several layers would just kill it (in a positive way). I know this comes close to blocks, but so are symbols and groups in Illustrator.
I’m also aware of the Ctrl + Shift + Click, I’m using it ALL the time and I LOVE it.
Maybe the name “group” isn’t right then. I’m aware of the possibilities in Rhino, but a more efficient way to isolate objects while still being able to look at other objects would be very convenient.