Combine functionality of Email Registration

Hi,

Would it be possible to add the functionality of the Email Registration module? That way users wouldn't need two similiar login modules. The specific functionality I need is:

"A username is generated and assigned based on the user name part of the email address. Subsequent users who have the same name (email prefix) are numbered sequentially. For example, "johndoe@exampleA.com" would be assigned username "johndoe", "johndoe@exampleB.com" would be assigned "johndoe001" and so forth."

The username field is then hidden during the registration process.

Thanks.