I talked to Clint about bad snaps once upon a time and he wasn't going for it. The problem is players can't deal with the fact that bad things can happen, and with dice rolls they can happen consecutively, which leads people to say things are broke. His example was that if a guy gives up a TD on a bad snap due to a bad dice roll, next drive he conceivably could come out and roll a bad snap on the first play.
People tend to forget that even with super low probability of things happening it doesn't mean once in a blue moon it can't happen repeatedly. With the snap there wouldn't even be opponent interaction like a hit stick on a fumble so it just compounds the rage people will feel. Think of it like back to back bad drops on open passes, when this happens people scream the game is broke but in reality it CAN happen so when it does they look at it in a vacuum not in the realm of this sequence of events occurs hundreds of million times and your just experience a bad stretch.
Long story short I don't see it coming anytime soon. We did talk through a system that did take user input into account (using jump snap as a trigger possibly) but it still seems a ways off before being considered.