With four limps in front you probably don't have the best hand (You might have a little pot equity but it's very likely to swing wildly on the flop). Poor players pick up mitts just as often as good players do. At least one of the four rates to have one.

Is raising preflop with 109s here easy? If someone comes over the top do you still think you have the best hand? Or do you make it four just for show?

This seems like a very volatile way to play a speculative hand.

Limp preflop and you are fine. See the flop and your line would be clear. Let the others wonder where they stand while they act before you.

Jam preflop and the flop gets checked to you and most of the time you have no clue where you stand. One advantage to your line is that you can check behind and see the turn, but is that worth 4x preflop investment?

There is now a huge pot which will force the players to play similarly which means little to no chance to outplay them. Then the flop comes down and your pot equity might go way up but it's far more likely to go way down (medium TP w/lame kicker very multiway in a huge pot is a recipe for more mistakes which means you need straight/flush chances further demonstrating the speculative nature of your hand). Seems like you are gambling with gamblers (for four bets each instead of one) while you have no edge. Are you getting them to play your game or have they gotten you to play theirs?