On a Mini4P Atti is only a mode that it goes into when GPS signal doesn't meet minimum requirements - AFAIK it is not manually selectable using the regular controller / software.
However that should not cause you great problems flying indoors IF...
Sorry I didn't see this exactly posted in the M4P forum and I don't have the M4P yet and Ryan has not yet created the mounts for M4P that I have seen but I'm sure he will soon. Sorry I don't know for sure.
Ryan has been known to work with...
I'm just going to throw this out there.
I paid less for my TWO SUVs,, TWO Sports cars, and THREE motorcycles combined!
There's not enough actual cost of manufacturing to justify that price for a photography drone.