I don't think that would happen, the unique settlements feature of BTW is the only thing that makes that mod
really unique, and understandably they wouldn't be willing to part with it.
Its a good mod though.
A fellow down at the Stainless Steel forums made a Stainless Steel sub mod that made Byzantine settlements look unique by mixing their eastern european buildings with Arabic ones, he should be willing to share that he already has for other Stainless Steel mods.
Heres the link:
http://www.twcenter.net/forums/showthread.php?t=167185