Can I define a set of characters, which will not be converted into htmlentities?

I have a UTF-8 site with content in various languages, utilizing characters from more than one 8-bit charset (mostly West- and East-European). I want all their characters to be recorded as characters, not HTML entities (e.g. character "ã" to be UTF-8 201h character, not "& atilde" entity).

Can I configure textsanitizer to pass these characters intact?