:shrug: As mentioned, I don't see anyway to not do it. Even if I scoop, I know the general layout of the cards as I do so. In the early game, I know the order of my hand when I discard. No opponent has ever noticed it, no one is ever harmed by it, and it provides me with the same warm fuzzies as blowing on dice.
Edit: And, as mentioned, my intent is not to cheat. Or, if you prefer, I don't see this as cheating, and if I did, I wouldn't do it. There aren't any rules about discarding order, all discarding is non-random to a certain extent, and, other than the extreme examples of slowing down the game or looking like you're cheating, it doesn't cause any harm to any player or the game state. Plus, one of the great virtues of Dominion is the symmetry - I also don't care if my opponent does it. To the extent discard-ordering has an effect, it is an effect that all are free to experience.