title: django-admin - how to modify ModelAdmin to create multiple objects at once?
body: <p>let's assume that I have very basic model</p>
  
  <pre><code>class Message(models.Model):
        msg = models.CharField(max_length=30)
  </code></pre>
  
  <p>this model is registered with admin module:</p>
  
  <pre><code>class MessageAdmin(admin.ModelAdmin):
      pass
  admin.site.register(Message, MessageAdmin)
  </code></pre>
  
  <p>Currently when I go into the admin interface, after clicking "Add message" I have only one form where I can enter the <code>msg</code>.</p>
  
  <p>I would like to have multiple forms (formset perhaps) on the "Add page" so I can create multiple messages at once. It's really annoying having to click "Save and add another" every single time. </p>
  
  <p>Ideally I would like to achieve something like <code>InlineModelAdmin</code> but it turns out that you can use it only for the models that are related to the object which is edited.</p>
  
  <p>What would you recommend to use to resolve this problem?</p>