You don't need other Admin's permission to ban a speed hacker. The only time you need another admin's permission is if you want to map change and you're not "senior admin" (the admin who was online first).

If there's some contention from other admins about banning a non-admin for breaking the rules, record a demo of them doing it and then ban them. If they bitch and moan, tell them to take it to the forums and post the demo to shut them up. Trust me, you'll get backup if another admin is playing favorites.

This stuff doesn't need to be so damn dramatic, but we appreciate you trying your best to help.