Multiple Rails Heads

I started a discussion with David (it's below) he suggested I address
the group so I am going to add further questions here.

1. Is there a way to put the different modules on different hostnames
that isn't just web server configuration?
2. What about static files?
3. Different memory (ULIMIT) limits for each module?
4. Selective loading of controllers to limit memory consumption by
each module?

Mark