It would be nice to have a feature by which you could control the frequency and order of adverts. For example to show all adverts by rotation, or to perhaps show 1 or 2 adverts more than once in a rotation.
Also (it may already be possible) it would be good to be able to run 2 (or possibly 3) adverts side by side at the top or bottom of the page :)
The first feature i've thought of, but not sure how to implement it properly.
The second isn't needed to be done by the mod. What you can do is just put both ad codes in the same content box. Theres nothing limiting you by only putting in one ad code in the box.