I am using tabs in the info pane to act as buttons when the pane is expanded. Eventually I want to move this over to an action widget, but pygtk doesn't support action widgets for notebooks yet. Hopefully this will be fixed by the next release.
I have created my own file chooser window that can select both files and directories. Currently, the "OK" button must be clicked to select anything.
Began experimenting with a filesystem selector that can select both files and directories.
Added a button class, and attached play/pause buttons to the bottom of the window.