Well, in its initial version, db did not have the necessary feature for a "good" flight simulation : i.e. it could not handle matrix calculations.
"professional" simulation use "state-space" techniques, wich require 4 matrices to be derived relating inputs to outputs (nothing to do with the 3D engine).
I don't know if you can do that with Db pro, maybe somebody can help.
I want indeed to write genuine space-simulations (nothing close to a shoot them up), featuring aerospace-planes, and I think I'll code that in C++ as DLLs, which I'll be calling from DBpro at a later date for graphic rendering. I'm an aerospace engineer, I don't know much about programming (that's where things go bad with C++), and I certainly don't want to waste time on coding a 3D-engine.