With 4 or more limpers, I'll play a *wide* range of hands from the SB that I wouldn't normally play from UTG, even though my position is worse than UTG postflop. The difference is that everyone but the BB has already acted preflop, so you can play hands that can flop great draws for cheap with huge preflop odds and implied odds postflop. I try to stick with hands that I can make a decision with on the flop.

For example, you're in the SB and four have limped ahead of you. You're getting 11:1 immediate odds to complete. If the BB isn't overly aggressive, you can play a wide range of suited connectors, suited one and two gappers, and small pocket pairs for 1/2 a small bet relatively often. If you don't flop a draw or your set, you can get away from the hand pretty quickily. If you do flop a draw, with that many limpers, you're probably gonna have pot odds to call a small bet on the flop.

Even if you do complete too often in the small blind, it can't possibly be a huge leak, as you only play from the small blind once every ten hands, and it's only 1/2 a small bet. I think a bigger mistake that people make is raising from the SB with moderately strong hands and forgetting they will be first to act postflop.