Insert header code for ads through Pro Sites

Just a quick suggestion for the Pro Sites plugin

I want to automatically inserts ads through the Pro Sites plugin, but many of the ad networks that I use require me to insert some code in the header.

It would be great to be able to also automatically insert that code into the head of each blog without having to dive into the source code for each theme (I have 598 blogs!), directly from the advertising section of Pro Sites

Cheers!

Sam