I like reading play by post games too. Not sure how the designing a villain would go. I'd be willing to give it a shot. My problem with creating supers stuff is that when I try it mainly seems fairly derivative of existing properties.
I personally don't mind which system is used to run something as long as it isn't interfering with the enjoyment of the players or the GM. I have found it handy to listen to some games to pick up the flow of some systems that I own but haven't played. I think the simplest thing is to go with what you and the other Wharties find fun. I enjoyed listening to the Fringeworthy game with the slight fudges.
I like the discussion at the start as people decide about the characters and style of play that they want. The prospect of mutiny comes up astonishingly quickly after Ross is elected captain. The innuendoes in this episode are off the scale