I had a look at backend_gtk.py and noticed that the toolbar code
could be simplified.
Instead of
iconw = gtk.Image()
iconw.set_from_stock(gtk.STOCK_GO_BACK, iconSize)
you could do two steps in one with
iconw = gtk.image_new_from_stock(gtk.STOCK_GO_BACK, iconSize)
The pygtk Changelog says that gtk.image_new_from_stock() has been
available since 1.99.5.
Regards
Steve