I've messed around with a silent snap and a few other things like that but it never really amounted to much. A season before our team joined I-9 I watched a playoff game and one team had defenders right over the center shouting so as to disrupt his snap count. Personally I would have demanded a penalty for unsportsmanlike conduct but they let them get away with it. At that point I began training my players for the silent snap but I never saw that happen again and I didn't see any advantage to it so we stopped.
I've thought about some trick plays using the snap count but never implemented them. Here is an example. Twins right, qb under center, halfback directly behind qb. Qb gets under center and begins down, set... He stops the count and trots towards the left sideline where the coach is at. The center does a silent shotgun snap to the halfback who then throws to the qb.
I combine a silent snap count with coded play calling. My players do not huddle, but look to the sideline for the next play while walking to the new LOS. It was pretty ominous at first as we would run a hurry up offense in complete silence.
A change in league rules this year mandates the silent count go away, but I intend to have my QB yell out "ready" once everyone is in position, and the center hike the ball when ready. The implementation of the silent count has all but eliminated off sides penalties as the team is well trained to fire on ball movement.