Allow signature etc to specific user
 

I want to give permission of signature/avatar etc to specific user/s. Generally this permission for whole usergroup.
Is any add-on or setting available for this purpose?
My forum is running vBulletin version 4.2.2 Patch Level 1

Your best bet here is to create a usergroup with the signature/avatar permissions you wish to give to the select users, and then add this new usergroup as a secondary usergroup for those users. :)

Its also a good idea. :D:D
But better option is availability of any add-on.

There may be a product for that, although I don't recall seeing one. It is easy to use usergroups for this purpose and simply let vBulletin's native code do the heavy lifting regarding permissions. ;)