I see Yes, I don't use them much too - in this case I couldn't create 'snxm' folder as there already were a file with the same name.

I've noticed one issue (which is not likely to affect anyone not using cyrillic layout) - when I create a note in Russian via website and then sync on my n900 I get these:

If I create it on the n900 first there seems to be no problem.

I'll try to look around myself though I'm not much of a programmer the problem seems to be rather common (ISO instead of cp1251 encoding)
I'll let you know if I can make it.