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What's the support Padrino provides for non-ActiveModel ORMs? How does Rails not provide that support?

You can host arbitrary Rack applications inside Rails with a single line in routes.rb.

Can you host arbitrary Rails applications in other rails applications like you can host arbitrary Padrino applications within another Padrino application? (it should even be possible to host padrino apps in any other rack app, though I've never done that so far, it might need a little hackery)

Yes, they're called Rails Engines:

http://edgeapi.rubyonrails.org/classes/Rails/Engine.html

Rails is a Rack application, so yes a Rails app could play host to more than one sub app. In fact this is such a good pattern, that Rails core added Rails Engines which do just but better.

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