Press [F1] on options menu for more balls. While playing, press [ESC]. When asked to quit, press J. To get 2 balls and also have control over the ball press [ESC], [B], then [J]. You can make the flippers 'stick' by pressing [X] and [/].
Extra Ball
Using Version 2.0 of the game (all 3 packs), press ESC - B - N to get an extra ball drop in at the center of the table.