Folders in the multidock?

Yeah, I think I get what you mean. At the moment, we just have tabs at the bottom edge of the Multidoc. You would like to see folder somewhere too, with the ability to group certain items in that folder. I'm trying to think what that would look like. You could make it so that the tabs themselves are the folders, and when you click and hold on the Folder tab, you are presented with a list of items that are within the folder, whether it be a PRV or Step Sequencer or Soft Synth properties window.

Console View wouldn't need to be in a folder, so that would remain the left most tab.

You would then need to decided whether each folder contains just PRVs, Step-Sequencers or Synth Props. Or, like you said, you could use folders to contain all the items associated with a track, and a track would have a PRV, Step Sequencer and Synth Prop.

That's my thoughts anyway ;^)