I'm not sure if this is an option on the development side, but the silly Maemo "auto-captitalizes" the first letter of BOTH username/password in mitter. The username/password masking is so efficient in mitter that users might not notice it...
self._widgetTree.get_widget("usernameentry").set_property('hildon-input-mode', 7) self._widgetTree.get_widget("passwordentry").set_property('hildon-input-mode', 7|(1 << 29))