If it were added, it should be added as an optional "check the box" type thing along with the other summons.
The first question is whether or not it should be added as an automatic summon option, because it is a summon though one with a chance of failure.
The second question is, if this would be added, how many times should mafia try to recast before calling it a failure. Just try once? Try up to 4 times, since Crowther says that his logs don't have any times where it took more than that? Just keep trying and hope that the user didn't summon it outside mafia which would make it just keep trying until all the user's meat is gone, 5 mp at a time?
The answer to the first, for me, is... eh, maybe? Precedent says it should be there. It's a summon and we have the other joke skill Summon Crimbo Candy in there.
The answer to the second for me would be... not more than 5 times. Because the user can summon a sandwich in vanilla, burning all their MP and meat as punishment for not always using mafia is bad programming and press for us.