Mounting multiple instances of the same engine in Rails 3

Question

Hi,

I'm wanting to make use of the new modularity prospects offered by the architecture changes in rails 3. However, rather than just mount an engine as in the majority of examples...

Rails.application.routes.draw do
  match "/blog" => Rack::Blog
end

...I'd like to mount multiple versions of the same engines, and have those instances independently configured. Something along the lines of...

Rails.application.routes.draw do
  match "/news" => Blog.new("path/to/blog_1/config")
  match "/blog" => Blog.new("path/to/blog_2/config")
end

Is this sort of functionality catered for? Has anyone implemented anything similar?

Thanks, fturtle