A more OS-integrated side bar

Drag and drop files and folders (from within the app and from other apps), file renaming, a contextual menu (especially useful actions: open with, reveal in Finder/Explorer), file icons (the line height allows for icons, to easily see the filetype)

The current sidebar is quite bare bones, the plugin I found revealed to be quite a hack and don't integrate well with the OS ("Open with" doesn't load system applications)