public_html assigning to multiple users of that domain

It would be nice to manually select a directory of a "user" in administration mode for a specific domain so when you create a domain, you can point that domain directory in a specific folder eg: instead of it being in home, it could be in /var/www/domain/public_html and assign users to /var/www/domain (of that specific FTP User) to that domain directory instead of /home/USER/public_html

(it messes up the home directory, for the domain and when you try to sign into another user under that domain) it won't even edit the main domain name; that's assigned to admin.
I like the fact that users can still upload; but it has no effect on the main domain; Why would you create a user for the domain and they can't even edit the main domain to begin with?