For Georges's Tools click
here or
here.
As far as the specs go - i'd say it could handle it, but would you really want to start up +400 extra processes?
i don't know if there's really a benefit to having them already booted - i think there is an option to save zone state on shutdown so any 'temp' stuff should still be there when it boots back up.
You could give it a shot and see how it affects performance of the server.