The easiest way for the "return a fumble for a TD" is as mentioned. Use 2 controllers, kickoff, let the return man catch the ball and his blockers run up-field. When the player one tacklers get close to the return man, press down on the player 2 directional pad. The kick returner will toss the ball backwards. Since it's essentially 11 v 1, the player 1 characters will scoop the ball and take it to the house. Easy.