We have. I tried approaching Jaxel in the past about his Conquest system, but never got a reply. Guess he's busy or something.
Instead, I have asked xfrocks to look into coding something similar. We're open to ideas.The Conquest system with a few additions works for us, but we'd not mind taking a radically different road, either.
Ideally, I'd love seeing an xF equivalent of the old SRE game for BBS's or something like that. That was highly addictive, and would be perfect for our needs.
Haven't heard back from xfrocks yet, though It's probably a rather big undertaking.