I usually like to play tight early but in these fast blind tourny's even if you last you have no chips to use for power. So, you want to gamble a little early like you said (limp in) with medium hands, but remember others will be gambling too so you have to push the raises up a notch on your big starting hands or you will get called by 2 or 3 people. If you can pick up a blind every round or two with these raises, you'll be in good shape. And of course steal from late position on every opportunity when the blinds are tight players.