Template static page and posts
this basic "feature" needs elementary php knowledge as it's "implemented" on template level since beginning.
Just check what type of page is being visited, and load a proper template file or just show proper code for such page type.
Page template can also be chosen per site basis within page options window.
It's a bit broken (still in B.v3.13.1?) but exact description on how to use it was posted by one of the forum members.