[Plugin: Invitation Code Checker] Blog Registration?

Hi, I’m using the latest WP and BP versions.

I was curious what it might take to edit this plugin to allow for normal registration but require a “code or password” when users create a new blog?

My site has been getting hammered with spam blogs for 6mnths at least. I will try a new plugin or hack and it will stop them for awhile but they always come back.

So I finally disabled blog creation during registration but it didn’t help.

Is it possible to modify this plugin to allow blog creations only with a password?