re: Poker & Omaha: When to bet OOP
Although I prefer PLO8 and LO8, I play a quite bit of PLO (hi). But can tell you that a PFR (pre-flop raise) in PLO is rarely a bluff. It might be ill-advised, with a hand worse than your opponent thinks, but they DO have something decent, at worst a high pair. Different from O8 when a PFR can mean either a high OR a low.
So I believe it is a perfectly sound strategy to pot raise preflop in EP or OOP to isolate with an extremely strong hand (AAKQ single or double suited types - (as opposed to 79TJ suited types, which you will want to limp with)). Often enough, even limping will suffice to make someone think twice about a raise. Because most experienced PLO players knows it is a post-flop game, the flop can bring anything to your 4 cards.
Bottom line, it depends on the table to some extent. At a fairly tight table with some players I respect I will limp a good - great hand from anywhere. You can always get out on a 3-bet pot raise or such.