Not that I'm aware of, Michael. I've always had the impression that the ability to generate a forward fill is not a simple task, since it's not an "all or none" situaton. Even in DEM we have forward hatch/patterns but not fill.
You may want to pose this question on the MicroStation forum as well just to see if there's any additional interest or direction. Since we inherit this type of functionality from the Platform team, the more the merrier!