It's not a written procedure to add a few knots. I suppose it'd fall somewhere between airmanship and technique. I don't think an FAA inspector in the jumpseat would fault a crew for increasing Vapp when it's sitting right above Vls.
I've heard of one person (thankfully not at my airline) who uses ref+10 all the way to 50ft even in calm wind, all in the name of smoother touchdowns. That's something else entirely.