I'm looking for the same thing. I just installed Mapquest Navigator 2.3, the old free version, that has now expired????. Well anyway, it automatically detects satelites. If you find any info pass it on.
Are you sure you're not confusing Options->Advanced Options->GPS with a Google Maps option? I've never seen any option within Google Maps to select the GPS Source.
Google Maps should run fine on its own. I've never had to open BB Maps (I don't even have it) to run Google Maps.