Rails - Oct 2013 - rails admin: how to set it to use custom controller instead of devise controller?

I''m trying to make rails_admin use the custom registration controller
that
I used, instead of the devise one.

Meaning when I enter with /users/sign_up it uses the custom controller that 
has a method that I need, however if I create a user with rails_admin it 
seems to use the devise controller and not mine. I tried to "update" 
rails_admin using rails g rails_admin:install, no luck.

routes.rb

Siteconfigurationlistgenerator::Application.routes.draw do
  devise_for :users, :controllers => {:registrations =>
"registrations"}
  mount RailsAdmin::Engine => ''/admin'', :as =>
''rails_admin''

registration controller:

class RegistrationsController < Devise::RegistrationsController
  after_filter :create_folder, :only => :create
  def new
    super
  end
  def create
    build_resource(sign_up_params)
    if resource.save
      if resource.active_for_authentication?
        set_flash_message :notice, :signed_up if is_navigational_format?
        sign_up(resource_name, resource)
        respond_with resource, :location => after_sign_up_path_for(resource)
      else
        set_flash_message :notice,
:"signed_up_but_#{resource.inactive_message}" if
is_navigational_format?
        expire_session_data_after_sign_in!
        respond_with resource, :location =>
after_inactive_sign_up_path_for(resource)
      end
    else
      clean_up_passwords resource
      respond_with resource
    end
  end

  def update
    super
  end

  def create_folder
    path =  Pathname.new(Rails.root.to_s + ''/tmp/'') 
    directory_name = resource.email               
    Dir.mkdir(path.to_s + directory_name.to_s)              
  endend

How can I make rails_admin take the custom controller instead of the devise 
one? I really need that create_folder executed.

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