I doubt that a it is practicable to emulate a view camera for a single pass render, and certainly not in a wysiwyg preview mode. Perhaps something could be done with reflection or refraction, but I have no idea how.

You could render the scene, then use the render as a material on square primitive. The square could then be tilted at any angle, and I think this would emulate the perspective corrections achievable in a view camera, but I suspect the image quality would suffer too much.

I have never done any really large scenes, and am wondering why you say that "Poser's cameras are not well-suited for large scenes"?