Not to pile on, and not to get into any personal anything, but flying down the runway in gusty conditions doesn't sound like a plan I'd execute unless I had to.
Again, I'm not a CFI, and I agree that you don't need a short field to practice short field techniques. BUT..if you are a CFI, and you're selecting very long runways to practice student landing on because it's safer, I'd suggest you're doing something wrong*. Teaching students to know how to go around when they're no setup correctly is part of training, IMHO. Teaching them how to compensate by floating down the field sets them up for bad habits, as I see it.
*Not counting things like wanting something long for practicing simulated engine failure on climbout, for example.