[private joker]

Well, one potential benefit to raising the river is that in case I *do* have MP2 beat and he is betting with some A, and Mike has a hand like KTs (which if he had, wouldn't he lead the river himself?), I could get him to fold half the pot with a raise -- since he'd have to call 2 cold not closing the action hoping he's chopping.

But I don't think that happens nearly as often as I get worse hands to fold and better hands to reraise me. Also, I disagree with your assessment of how 20/40 games play; they can be juicy, but not so donkish that someone will call a river raise on a board this scary with one pair.