Thanks for the paper Lad. My only problem with the materialiter/formaliter argument is that, to remove the form, is to change the thing substantially. Now when a man becomes pope - and I assume this occurs when the Cardinal deacon says "habemus Papam," at that instant the pope immediately receives substantialiter and formaliter the personhood of the pope; or perhaps it is just prior to the "habemus Papam" when the papal-would-be says "Accepto" that he becomes pope. This is to say that the cardinal (new pope) immediately receives the form, changing the substance of his person into "pope," due to the words spoken. If this is not the case, then I misunderstand the conferral of the office. The act of assuming the office must take place in time, and the action must be completed by force of words, and the office must be conferred via human agency from one man to another, even though the conferral of the office is not a sacramental action. I guess in theory, the cardinals could elect a man and upon his election, he could stand up and say "Ego sum Papa," and he would immediately receive the form, changing the matter of his person. The interesting thing is, once a man becomes pope, no set of "accidents" (in the philosophical sense) can remove the office from his person. All the Catholics in the world cannot get together and remove him. And it is arguable, if the pope convenes a council, the council "anathematizes" him, but he refuses to give his consent to the anathematization, whether this constitutes a removal from office. It would be interesting to see from a historical viewpoint.
In theory a layman could be elected pope; but at the moment of his being elected, he would need to be ordained and consecrated. This must mean that the only requisite for the conferral of the office is that he be a male, and a baptized Catholic. Or to extend the scenario, an unbaptized male could be elected, but immediately he would need to be baptized and receive all the orders. These are just a few of my thoughts on the matter, but it does not amount to a "hill of beans" to use the proverbial phrase.