RFE: Forwarding for Add-On Domain in Alias Server

Hi.

I was going through the Sub-domain creation process and its a bit confusing right now. Could you add an option for forwarding to a folder on the server when creating a new alias server.

For Example:

When creating a new alias server something.mydomain.com there is an option there to forward it to http://mydomain.com/something/

For this, is there is no folder defined, maybe an automatic folder can be created under public_html

I am only asking for this to make it easier to explain to our clients, how exactly to add a subdomain easily.

Thanks.
Faisal.