I can't imagine that many GMs thought using a hand on a faceoff was such a big deal that they needed to make it a minor penalty. I have never in my life heard anyone complain about that at any level of hockey. Even if they did want to eliminate it, why does it need to be a penalty? Why not just make it like every other faceoff violation--just redo the draw but with the center getting kicked out and if he does it enough times, then give him a penalty?
This encourages it. It doesn't prevent it. If you want it out of the game, make it a penalty. It'll be gone in 2 years.