I don't know, it depends on what range villain puts us on when we open limp. If I'm going to start open limping small pairs because I fear the light 3bet from the bb, then I have to limp at least some suited conns to balance my limping range so I'm not so easy to play against post flop. Now we're limping too much. I don't like limping 44 to avoid the difficult problem of being 3bet by the bb, if he 3bets too light then he's exploitable. So exploit him.