Blogs MU - Customizing 3 header sections or adding shortcode to network sub intro

I am trying to implement a rotating testimonial plugin which works great in the the header sections using the shortcode, but understandably not in the network sub intro. Is there a way to get the network sub intro to use a shortcode? If not, is there a way to customize the header sections to make the different widths, or even remove to being one header that stretches all the way across? I would be interested in both of these answers, as even if I can do the first I might want to do both. Thanks!