I play small pp's in all positions in the followig way. I will open with my standard 4x(+1 for each limper) bet if not opened or limped to me. If there has been a bet prior to me then I have to have atleast 15x the bet in implied odds in order for me to make the call. Also depends on the villain, ie is he likely to pay me off if I hit my set or not. If he's really tight and I don't expect to get paid of then I muck'em.

Don't take what I say as the final word as I am working on my own game!