I hate having to login to the admin panel to ban a user, anyway anyone could incorporate banning users from their profile and also allow mods to do this? There is no way for mods to ban bots, and this bugs me.
Create a warning with x points, set to never expire and which isn't editable. Let's call it "Ban User".
Create a warning action for the same x points to ban the user permanently.
If you want the user to show as banned in posts, create a Banned user group with the relevant styling and add to that group as part of the warning.