I used to use a Lumia 710 and I have a 920 now. I do not use them for Photosynths, but I do take pics with them. Occasionally back then with the 710 and frequent with the 920. The standard photo app of the 710 did not even record geo co-ordinates, the Nokia Camera in the 920 does, but it does not record direction, although the 920 has a gyroscope. So, ...
1. Please make sure that geo co-ordinates and direction are recorded properly.
2. As pics may be taken on the move, have it possible to refresh location lock by location sensors.
3. I feel it might be useful to have a preview for them too.