Unfortunately not...
The only really useful stuff in the above hidden menu is enabling speakers, and enabling / disabling the dual (rear window) antenna fitted to calais models..
The display colour (Red for SSV and HSV, Blue for Calais, Statesman and Caprice) is changed via programming the main unit EEPROM.
We also know how to change the startup screens from Holden, to Holden Caprice, HSV, Chevrolet, and for newer headunits Pontiac and VXR8 (Vauxhall), which also uses the EEPROM programming method.
The biggest problem with the EEPROM programming method is that it is a head unit out and take apart (Slightly) job at the moment.
I am sure we could program the above features via OBD connector using the 29Bit Can bus, but this is going to be a long way away.
(We haven't worked out how to write to modules yet using the 29Bit GM Lan)...