They should do a 'Make me a McPoyle' contest on Myspace and Facebook where people send in pics or videos of them dressed as a McPoyle. The gang picks the winner and that person gets to be in an episode as a real McPoyle!!
It would also be funny if they could get Jerry Stiller on the show for an episode or two. He could play Frank's old business partner, the waitress' dad, rickety cricket's dad, Charlie or Mac's mom's new boyfriend, or some other crazy old man character.