I've thought of doing that if only I could get just the two outer
motors to work for steering and have the inner motors work only
on throttle.

Ran across the perfect field for flying about a half mile from work.
It's 3 Soccer fields in one with not a soul in sight. Everyday I checked
it out and found no one is even remotely interested in this large field.
Perfect!
So today I drove in and a sign greeted me at the entrance:
NO RC PLANES ALLOWED! $500 FINE! [:@]

Some days...