Feature Request: Folder Tree in Sidebar

[meatware]

It would be great to be able to optionally partially/fully replace the Places & Bookmarks section in the sidebar with a folder tree.

This would be good because Places & Bookmarks can be accessed from multiple different places (Top menu & Fave star near file location bar).

It would also be good to have this mapped to keyboard shortcuts so the folder tree could be quick toggled to Places & Bookmarks if needed.