First off, I created a generic information file ("/information/index.html") in my default group file ("etc/skel/......")

I want that file to automatically be updated when a new site is created so that all my variables are changed to the user's domain.

IE:

Site Administration Access: http://www.yourdomain.com/siteadmin/

I want that line to read:
Site Administration Access: http://www.joeblow.com/siteadmin/

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Just like the default page that comes on the RaQ where it replaces the domain name instead of a generic variable.

Hope I'm not asking the impossible.

I don't have a RaQ no'more but did you look at those default pages and check the code? If they did it, you can do it, that's my feelin' matey.