I’m primarily a Cubase 6 user but I also use Ableton Live sometimes and their current implementation of Group tracks is awesome. Any single track that you put in a Group (which acts like a Folder track in Cubase) automatically has it’s output routed to the group’s output. It’s like a hybrid of a group and a folder. If a track is in the folder it’s physically inside and gets automatic routing to the master fader for the group.
I wouldn’t want this to replace the current “Folder Track” as that has it’s uses but for a lot of the grouping I do it would be more convenient to have the routing all done automatically. An option to have the track contents inherit the Group/Folder Track colour wouldn’t hurt either.