What do you mean "is there any type of strategy to use in a game where position virtually means nothing post flop"? Position always means something, if you're on the button, you're still last to act, right? If you're last to act, so what if there are already three limpers, if you have a hand, make them make a mistake, raise the size of the pot. If they call, it's not the end of the world if your hand figures to be the best. If you're constantly worried about them making the nuts on you, you really shouldn't be playing to begin with.