rails_admin dashboard/secondary_navigation customization

Question

Any chance to customize dashboard or secondary navigation?

Yes i can create app/view/rails_admin/main/dashboard.html.haml and redesign whole page from scratch. But what should I do if I want just add simple partial before and safe current content?

In case with secondary navigation I tried to replace _secondary_navigation.html.haml in all places where partials could be - nothing happens.