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First of all sorry for my English, and if that is a very stupid question.

But I do not see more than decorative function, unless PM's between friends is allowed.

Thank you and I hope your answer.  

user has option to receive PMs from buddies only (check here - messaging & notification)

(2015-01-31, 05:35 PM).m. Wrote: [ -> ]user has option to receive PMs from buddies only (check here - messaging & notification)

Thanks!
Any other functionality?

You have a quick link to access their profile.

Edit: delayed response

please see replies at this discussion

There are also plugins that extend the buddy list functionality, for example by showing them on profile (MyProfile).