Adding recognition of what the buffs do is probably fairly easy simply by knowing the format of that data file, at least for most of them. Super Skill probably needs code added in other places. (Ninja'd on this point, though to avoid future confusion it's 8636.)
Adding the ability to get the buffs starts with deciding on an interface. CLI command, Daily Deeds? Whatever it is, it needs to check that you're wearing the pants, then visit two different URLs.
Ideally, mafia would recognize when you have one of the buffs and try to protect you from taking them off (for things like buying seltzer and such), but that sounds complicated.