I think he means having ministers run the departments that would give advice and such and report on information that would be relevant to their department. I don't think he means other players running certain aspects of the game. This feature if added would be redundant. All the information is already given that ministers would report, it would just be like adding at the top of each page, "Good afternoon sir, Minster (insert name here) reports the following information about the education department." I could be wrong but this is what I believe he means by adding ministers.
Fed minsters are already occuring, just outside the actual SimCountry web pages. Most established feds have forum boards where ministers are elected to run certain aspects of the federation. This feature could be added to SimCountry, however I don't believe it would be very high priority, and what type of powers would fed ministers have within SimCountry??? Maybe it would be adequate to have a vice-chairman of a fed to allow the same powers as the chairman in case of their absent and what not.