The umpire calls the player out on a close call, the coach runs out of the dugout yelling he's safe, then the kid goes back to the base after all ready accepting that he's out. I can see it from here. That's not coaching a game that's manipulating it. Lets not forget about sportsmanship. The ability to win or lose and still have respectability.
Coaches have so many good ways to help their team without resorting to all of that stuff.
The batting order is one example. Get those speed demons on base and so your hitters can move them around the bases. Who's the best to be able to lay a bunt down. Those are the type of things a coach should be thinking about. The winning and losing is not what's important, it's how you go about it.