Disallowed characters in URL and search

[eluser]victorche[/eluser]
Ahh, update: this thing is really buggy

Forbidden characters, Ok ... but why any cyrillic letter is "disallowed" also? You can not damage a site by entering "ажаогиуигт"
I tried to add in the allowed characters "а-я", which is like "a-z", but for the cyrillic alphabet. The result is... In some cases (letters), everything is Ok. But in same cases "The URI you submitted has disallowed characters". It likes the letter "я", while it hates letter "щ".

Sorry, but this is a joke. Unacceptable for a serious project like CI ...