Pass blocks to before/after filter methods using :with option

I recently found a need to have an application-wide before_filter perform differently from certain controllers. I thought it could be useful to do something like:

class ApplicationController < ActionController::Base
  protected
    def redirect_unless_logged_in
      block_given? ? yield(self) : redirect_to(login_path)
    end
end

class SpecialController
  before_filter :redirect_unless_logged_in, :with => proc { |c| c.redirect_to special_login_path }
end

Obviously, this wouldn't work for an around filter.