Two features I would realy like:

Center on GPS:
While travelling, automatic panning of the map (instead of manualy pressing 'current location'., So the map scrolls automaticly in the direction you travel.

Disconnect GPS:
An extra menu option to gracefully disconnect from the Bluetooth GPS connection. Now I must shutdown my whole Bluetooth connection on my phone to disconnect. If I don't do that, sometimes my phone crashes after exiting the application.

And of course application signing, but you're already working on that, so I don't have to authorize file access after every zoom action.

Keep up the great work!