But not sex swapping characters, then? Because I've seen mods that do that and hang around.

Also, if the next TES game is set in Hammerfell as rumored, I suspect there will be race swapping mods and only some will be considered in violation. Because most of the characters would likely be Redguards (and thus black), and I can see people upset that the PC can be a white guy (which is how one would describe the other races of men) killing lots of black people (Hammerfell is the homeland of the Redguard, the only race of men you'd call black). So I fully expect mods to make random encounter villain groups more racially diverse, since you'd expect them to be Redguards in Hammerfell about as often as they were Nords in Skyrim (aka most of the time) and I can see that being too many black people being killed without comment for some people to be comfortable.

Either that or for Bethesda to do it themselves, and come up with some explanation why mysteriously the natives aren't mooks very often just to avoid the bad press.