[King Kovifor]

You could comment out the permissions in the the plugins (but in the Username History it would show for nobody but the owner.)

Username History Plugin:
REMOVE

PHP Code:

 OR $vbulletin->bf_ugp_unreq_perms['canviewunhistory']; 


from the first line of code.

Username Request:

Comment out this code:

PHP Code:

    if(!$vbulletin->bf_ugp_unreq_perms['can_change_un'])
    {
        unreq_add_error($vbphrase['unreq_perms'], $vbphrase['unreq_perms_txt']);
    } 


and

PHP Code:

    if(!$vbulletin->bf_ugp_unreq_perms['canchangeun'])
    {
        unreq_add_error($vbphrase['unreq_perms'], $vbphrase['unreq_perms_txt']);
    } 


To Comment out lines of php, add "//" in front of the line.