No, this is not allowed. You will have to stay with your current username for now. There is the possibility that we will release an item that will allow you to APPLY for a username change in the future, but for now, please do not create more than one account, or all accounts will have to be banned.
If you would like to change the email we have on file, then you can send in a support ticket or rmail me directly, and I can change it for you on this account. =)