devise_for now accepts a block. All routes inside the block uses the scope defined by devise_for.

You are now allowed to do:

  devise_for :users do
    # Non conventional sign_in route
    get "/sign_in" => "devise/sessions#new"
  end

And it should work as expected.

test/rails_app/config/routes.rb

@@ -1,4 +1,5 @@
 Rails.application.routes.draw do
+  # Resources for testing
   resources :users, :only => [:index] do
     get :expire, :on => :member
     get :accept, :on => :member
@@ -6,9 +7,28 @@ Rails.application.routes.draw do
 
   resources :admins, :only => [:index]
 
-  devise_for :users
+  # Users scope
+  devise_for :users do
+    match "/devise_for/sign_in", :to => "devise/sessions#new"
+  end
+
+  as :user do
+    match "/as/sign_in", :to => "devise/sessions#new"
+  end
+
+  match "/sign_in", :to => "devise/sessions#new"
+
+  # Admin scope
   devise_for :admin, :path => "admin_area", :controllers => { :sessions => "sessions" }, :skip => :passwords
 
+  match "/admin_area/home", :to => "admins#index", :as => :admin_root
+  match "/anywhere", :to => "foo#bar", :as => :new_admin_password
+
+  authenticate(:admin) do
+    match "/private", :to => "home#private", :as => :private
+  end
+
+  # Other routes for routing_test.rb
   namespace :publisher, :path_names => { :sign_in => "i_don_care", :sign_out => "get_out" } do
     devise_for :accounts, :class_name => "User", :path_names => { :sign_in => "get_in" }
   end
@@ -23,15 +43,5 @@ Rails.application.routes.draw do
       }
   end
 
-  match "/admin_area/home", :to => "admins#index", :as => :admin_root
-  match "/sign_in", :to => "devise/sessions#new"
-
-  # Dummy route for new admin pasword
-  match "/anywhere", :to => "foo#bar", :as => :new_admin_password
-
   root :to => "home#index"
-
-  authenticate(:admin) do
-    match "/private", :to => "home#private", :as => :private
-  end
 end