WordPress MU

I'm thinking about this (in sub-domain capable wpmu),
When user sign-up without blog, they have option to create a blog, or just username only.
if new user select username only, they can login to dashboard, and changed profile, including their website address.
if they create a blog, this value is their user.wpmu-domain.com,
but if they only create a user name, this value is wpmu-domain.com (sure they can change this to whatever)

what if, when the user register a username, but without creating a blog, they can change the website address in their profile, then every request to user.wpmu-domain.com will be redirected to user's website address?

it's just like a sub-domain redirector, but with an option to create a WP blogs.
my idea is combining such scripts like miliscript (http://www.milliscripts.com/) free php redirection script with wpmu, but that just a waste of time.

perhaps anyone here can do a bit hack with index.php (wp-header.php) and .htaccess, to check whether a subdomain already registered with a blog, or just a username only, then redirect to user's website address if there's no blog set up.
again, a modification also needed in user profile's page to set-up a blog with user's name/sub-domain, which then will change user's website address to default his/her wpmu-subdomain.

it would be great if wpmu can do this

it would be great if wpmu can do this

-1 on the idea. Much too easy for spammers to create account and have them link back to their sites elsewhere. I know most of the "senior" (for lack of a better term) admins here sit on their newly created blogs but I know I pay zero attention to the user list.

Feel free to open up a ticket on trac and make the suggestion though.

what do you mean by spammers?
if you mean bot spammers, wpmu already equipped with features that forced new registration to be activated from valid email.
2nd, as i said, default website address is user.wpmu-domain.tld, you need to change it manually if you want to set to another website address.
both condition already prevent automatic/bot registration.

Spammer doesn't necessarily mean bot.

And by default, MU doesn't block bots.

And those bots can click on the link within the email fairly easily to activate the account.

My old regular wordpress blog had a couple thousand bot accounts since I had comments set to only be left by account holders. You can tell by the weird usernames.

That way when folks left me comments demanding wordpress help, I had a way to contact them. Before that, 90% of the demanding comments, they would never leave a way to contact them or the email address that they left didn't work and then got even more rude when I didn't email them back.