Two comments:
OpenType/CFF fonts should work to some degree on versions of Mac OS from 8.x on. "Some degree" means that pre-Mac OSX, you need ATM for them to work, and you only get the Roman char set. On Mac OSX, Unicode savvy apps will give you access to the entire charset, but at the moment only Adobe apps support any OpenType features.
About your problem with CE charset: this is a known problem, and is still a mystery. Adam Twardoch has reported the same problem and has supplied some test fonts. I have spent over a day looking over the fonts, and looking into old code, and can't find any problem in the font data. Investigating further is likely to be a several day effort, and will happen, but not soon.