When creating new hosting package, allow username to be same as domain name so that it is unique

When creating a new hosting package, allow username to be same as domain name so that it is unique. On a shared platform, if another customer on a reseller account has the same username, then it cannot be used by another customer who wants to use it, which is quite silly.

So for example, I create a web package with domain name: "asbestos-ace.com", so username should also be "asbestos-ace.com". At the moment the username field does not allow for special characters such as ".", "_", etc. This needs to change if possible.

Can the developers please allow for special characters in the username field and to let us use the domain name as a username as well. Would be helpful and make the account extremely unique to that domain name, therefore avoiding disappointment and make it even more secure.