It would be great to be able to have the roof overhang be a separate thickness (or even structure).
Typically, even if I'm using bigger rafters for a roof (e.g. 2x12), the soffit/overhang is 2x4 or 2x6 max.
I know of the fascia settings (which have their own limitations) and have worked around it other ways, but would be nice to have something a bit faster.