Can you get three copies of a player and not of a missile (or vice versa) using batari BASIC?
NUSIZ0 and NUSIZ1 control the numbers and sizes of the players and missiles. NUSIZx affects the number and spacing of players and missiles at the same time. However, the size (width) of the missile is separate from the size of the player. Thus, you can set the player 0 width to be different than the missile 0 width, but you can't set the number of copies to be different than each other.
This is controlled by the TIA, not by batari BASIC. The NUSIZ0 register works as follows:
Bits 0, 1, a