Why do kMS, jMS, etc. allow Roman Characters, but gMS disables Asian?

I would assume that the default maplestory font not having Chinese characters/whatever language would have something to do with it.

This is something I was going to point out. The default font JMS uses includes roman characters. I don't know about Koreans, but it's not as if Japanese only stick to the kana. Sometimes it's useful to use roman characters (outside of emoticons of course, such as orz). The Japanese actually use roman characters from time to time. Not many English specials use the characters from Asian languages, so why include them? The default font used for Maplestory doesn't include those characters either, and Maplestory is a non-unicode program.