Perhaps it'll help if we could itemize/model a few business application forms. Specifically the patterns (UI structure, data-model, and the interaction.)
What I've experienced is that it (forms generators) quickly degenerate into a closed loop motor that's sort of hard to customize/change for unexpected usage scenerios. I agree with a users comment to keep it simple. Allow a few applications to be built which will also lead to better case-studies and docs.
