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It wasn't clear to me from the video, are those stacks preset or can I specify Rails 2.8, MySQL 5.2, and so on?

Right now stacks are set based on preference, compatibility to cloud providers, etc

I know it mentioned somewhere that custom stacks were an option but could not find any documentation.

We will enable custom stack soon!

I'd love to see a Scala/Akka/Play 2.0 stack.