Added

map.xml is part of the source code. It is packed into gamedev.bnp (i think) in the compiled client. Ryzom has a feature to accept a file like map.xml to override the default one. However, modified game clients are at least not supported and might get you into some trouble if CSR don't agree this is a harmless modification :-)

I think the point Karu was making is that it is much less than a programming task, it's changing "2" to "4" or "8" in a human readable configuration file.