You can gain "points" for certain feats performed during a game. An easy way to get a lot of points is to throw a perfect game. This is worth 100 points. Switch controls every time the CPU is up at bat and intentionally strike out. This will get you points for 27 strikeouts, and for a perfect game. Repeat as many times as needed.

To get more points in franchise mode to sign your free agents, during the off season either create a player and pick him up as a free agent or sign free agents and release them at the end of the season.

Use two controllers and keep throwing fast balls on both sides until a late inning. You can go into extra innings for more points in strikeouts. Then, hit a ground ball on the team you want to win and make the other team just hold it. Run around the bases with the other controller. This will count as an error and give the other pitcher a no-hitter.