Better players:
Select the "Extras" option at the main menu, then choose "Player Management". On that screen is a category called "Player Editor". It allows you to improve players. In season mode, go to "GM", then choose "Player Management", then "Player Editor". Note: Making a player all A+ may result in the game freezing in later innings.

Free balls:
If you are down in the count or need a quick ball, pretend to lay down a bunt. Pull back while the pitcher is in his motion. This should result in a ball being thrown. Note: This only works up to two times in an at bat.

Easy points:
Start a two player game, with only one actual player. Throw a perfect game, striking out every batter. Save the game in the bottom of the ninth inning with two strikes and two outs. Finish the game, collect your points, and save the options. Reload the game and repeat to collect the points again.