As you probably know, YaST does not accept "special" characters for shortcuts or memnotics. Most languages handle it properly. Thomas just added this comment to "Bug 673042 - cyrillic and greek access-keys do not work in installer":
The whole yast framework supports A-Z, a-z and 0-9 for shortcuts only. Adding support for non-latin characters would affect a lot of code.
Non-latin characters are not supported on purpose. You never know which particular characters are available on the current keyboard. That's the reason why only A-Z, a-z and 0-9 are allowed.
The best way to offer shortcuts for languages with non-latin characters is to append e.g. "(N)" as proposed by Karl in comment #1.