I don't think you can add favourites to the toolbars Yes, well, well, a shortcut would be enough / great. but you can access your favourites fairly quickly by clicking on the icon next to the document's title in the header, and choosing Go to. Your favourites will be displayed at the top. Yes, inde...
You can access the path fairly quickly by clicking on the icon next to the document's title in the header and choosing Path. There is no path shown with me. Alternatively, click Reveal in Binder to reveal the document's location in the Binder (ctrl-shift-8). Yes, that's a bit inconvenient, I would ...