To get ascii to work for jp is probably going to require some digging around in fonts. If the S-JIS \x82 range of chars can work, then all you should have to do is edit the font width. Removing the double char ie "AA" will probably be harder. I dont know if its the game rendering wrong, or the font being weird, or the game messing up with ascii. Something tells me by the time someone figures this out, we will have figured out 3.7+ keys lol.