Okay, I've actually gone away and thought about it for a few minutes, and I drew up some of my worries about it, and how I think it would be best to have it develop, instead of picking 'traits' and evolving the maps through breeding (because we know someone would breed Hoodoo with Turbine and get map which plays horribly and looks crap - and then everyone loses out).
Apologies for the crappy photo, but it should be just about legible.