vbulletin Registration Deny username with Caps lock

[Naijasite]

I have a lot of spam Bot registration with similar username typs with Caps lock after the first word in the username.

Example of spam username:
IKowalski
KMcClella
KDesmond

Please how can i deny registration with username with caps lock on forum registration.

First word can have Caps lock other word should be lower case.

Your assistance will be appreciated.

[Naijasite]

If am able to disable Caps lock on username the registration will be denied.

Since the spam bot uses usernames such as nManaClass or MspamCme.

[tbworld]

What you want to do is actively detect the shift-key. If the shift-key is detected then it is a real live person. A bot (spammer) will never be pressing a shift-key. Is this what you are trying to do?