As far as I know no sane IRCd supports this atm.. UnrealIRCd doesn't and I know it is possible in InspIRCd, but only after editing the allowed characters in the config file, at which time you will lose our support. There is no other anope supported ircd that allows it without modding I believe.. and we don't support modded IRCds.
Either way this is not gonna happen.. I d like to say ever, but chances are maybe someday it will be tolerated, I hope not in my lifetime though.
Anope supports a multitude of IRCd's and it can only do so by following standards.. breaking them so some noobs can look a bit more fancy is just asking for trouble.