I agree with the limp and call preflop. I think the more interesting question is what to do if it is folded to you on the button. I always heard never open-limp shorthanded. HEPFAP (pp 197-98) says you should at least consider open-limping here from the button if raising is unlikely to cause both blinds to fold. I've been playing with that some lately, but have no real opinions on it yet.