Could I apply my own CAS (Central Authentication Service) in vBulletin
 

I am considering to purchase vBulletin , I got some questions .

1) Could I apply my own CAS (Central Authentication Service) in vBulletin ?
2) Could I apply my own topbar and footer ?
3) Are there any built-in report and statistic logs ? such as user activity , how many posts per day in a forum ? how many post and comment per users per day ?
4) Where I can integrate my own user right access group ?

Thanks in advance .