With the goal of quicker times, 4 hours or less, and penalizing groups who didn't meet this...
It would seem stuff like lost balls, OB, taking walk of shame, getting a rules clarification, etc could not only submarine your time, but all the groups behind you.
As for a shot clock, in other sports NBA, NFL, etc, its there for the competitors to see so they know how much time they have. How would this be implemented on the golf course? Would you have a guy following every golfer doing a countdown? Don't get me wrong, I love the idea...just having a hard time seeing the practical application.