I gave up on this software and now use RocketDock with the "stack docklet" plugin and "Standalone docklets" inside of those.
Not the same result at all but in my case it's close enough to the functionality I was after. If you aren't fond of the dock itself, I'd suggest going directly for the standalone docklets thing. It can create special shortcuts that open speech bubbles of the content of a set folder and one can tell it to be recursive, meaning a click of a subfolder will open a new bubble with the content in the sub-sub directory and so on.