I just created a ticket in lighthouse with a patch that lets you use
empty roles.

http://capistrano.lighthouseapp.com/projects/8716-capistrano/tickets/73-cant-use-empty-roles

Hopefully this is the right way to go about suggesting a change. The
basic problem is that you can define an empty role:

role :db, *empty_array

but then you can't use it later on, because it isn't added to the
roles hash. So running this setup task fails with an "unknown role
'db' (ArgumentError)":

task :setup, :roles => [:app, :web, :db] do
  # ...
end

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