$modifyUserRoles
To modify user roles, you can add/remove/toggle roles in same time
op can be:+
for add-
for remove~
for toggle
Usage
$modifyUserRoles[User ID;[op]Role 1;[op]Role 2;....]
Example (add role 1 and remove role 2):
$modifyUserRoles[$authorID;+role 1;-role 2]