I kept thinking of doing this for previewing strobes. Then Nikon stopped making the model I thought made the most sense.
I do like the idea of using one for scouting but I don't see myself carrying both.
Plus those really small cameras tend to have really small screens. Even a 4x5 view glass isn't huge but next to a little P&S it's almost ocean sized. I can't imagine trying to figure much out in the field from those little screens. Unless you bring a laptop to plug into-) But then I never really understood chimping either.