I don't think I have ever heard that deadheading was a bad thing, it can certainly keep the messy wet blooms from preventing new blooms from opening. If I have been pollinating a lot, I often use a tip Fred posted, cutting the flower off above where the pod would form, about the top two thirds of the bloom. That prevents the heavy wet blooms from pulling off a pod that has started forming and keep the plant looking a little nicer, if it can look nicer with clips and beads hanging from it. I will often deadhead in the mornings while waiting for the pollen to get ripe, then in the afternoons any blooms I missed I will deadhead while looking for ripe seed pods. As mentioned earlier some plants pretty much do their own deadheading and the blooms dry up and fall off on their own. The bloom scar left behind from deadheading seems pretty well sealed, I would not suspect that to be a problem.
