That would take alot of time and tbh I don't think multiplayer would work too well since IPACS makes high quality things everyone would need to have good phones to play it at a constant 30 FPS or higher and not alot of people have a good phone leading to worse user experience due to lagg and phone crashes and for fuel and ground handling to be implemented the devs have to tweak every single aircraft to make them compatible for fuel flow/weight
Good but impossible is nothing for Ipacs