Since this is a language learning forum I want to suggest a modification displaying the native language of a user in the user info panel:
I do not know if it is even possible in vBulletin, but I've heard it is highly customizable, so I think this can be done.
The problem lies in the fact that if a non-Russian asks a quesiton it is often automatically assumed, that he or she can understand English. However, this is not always the case. Moreover, even though he or she might understand English as a second language, some other people might know their native language and provide an answer of better quality.
We've got a forum thread 'what's your native language' where people can say what their language is, but usually nobody looks through this thread to determine if, the person whom he's writing an answer for in English, in fact, can understand it. Normally, all people whom I see here understand it (out of no other option available, I'm afraid), but it will be much better if the the information that is really useful (unlike the total number of posts or reputation power) is displayed right here where we need it.