I know you don't want any negative feedback, nevertheless it sort of goes with the territory.
I see this as an excessive feature...
Your issue could be overcome by simply telling your girlfriend that you're on your way to her house before leaving...
Anyway, I think very few people would bother spending several minutes making a complicated/advanced away message when leaving their computer.
Why not just type in your location, phone number etc. into the standard away-message feature instead of making people type a number if they want info about your whereabouts?
Sure it would be a nice feature somehow (especially the "send my photo" part), but definitely excessive.
Well that's just my opinion.
//Zred