I heard that playing shortstacked PLO in cash games can have a big advantage. Say ~50BB deep. I have a couple of question about this.
The general strategy for Omaha is the same for playing short stacked in any poker game. Play tight aggressive. The concept is that you put your money in when you are against a large field with the best hand. Because you are short stacked, sometimes you will have situations when you get it in and can't be made to fold, and you somehow win hands you might have otherwise folded. Compare to having a large stack, where you will have to occationally fold in situations that would have won. This is the essence of the short stack advantage. So Omaha, Stud, whatever... short stack means play tight up front, and get your money in aggressively, early. If your large stack opponets play the same general strategy, you will win more often because they will occationally bet each other out of a side pot, propelling you into first place for the main pot.
against a lot of broken stacks?- I'm pretty sure you mean all the stacks started big but not a bunch of them have lost a lot and are similar stack to short? Just so I can answer this part to be relevant.