Since I am integrating q2a to my website I already had a login made and since I am taking the function custom_nav_user_search() from the Theme in which I am working and instead I will replace it with my own login/signup buttons , avatar, notifications bell etc. in the right top of the header so it keeps consistent with the website design I am trying to create the sessions variables or whatever it be needed to keep both websites tables integrated.
I don't know if I got myself explained, maybe I am wrong with what I am doing but it is something occurred to me since I'll be adding field to qa users table and will implement my own face, twitter and google+ loggin.