Been working on OutpostHD -- a bit slow going but real life kinda has that effect sometimes.
Anyway, I've been able to add the File I/O window for saving/loading games. Still no system menu but pressing F2/F3 will bring up the Save/Load dialog (respective).
(http://i.imgur.com/jAebIjwl.png) (http://imgur.com/jAebIjw)