+1 for being able to use Google "Team Drives" in InSync just like other Google Drive folders.
On a related note, Google is implementing another sync product for Team-Drives, etc. It's in beta. I think it's a company they acquired. Appears to be something in-between a "map drive" functionality (where nothing is synced off-line) and normal Google Drive functionality (where only off-line synced files are available as a local file system).
However, I think there is still room for InSync to operate in the way we are all familiar - just adding this new set of "Team Drives" folders to the list of possible folders, or another top-level folder structure or something.