Disable timer:
Load or reset the game, then execute the following BASIC commands before running or restarting the program. 

POKE 8687,96
SYS 4096 

Always reach next track regardless of time: 
Load or reset the game, then execute the following BASIC commands before running or restarting the program. 

POKE 4627,3
SYS 4096 

Unlimited time:
Load or reset the game, then execute the following BASIC commands before running or restarting the program. 

POKE 8566,76
POKE 8567,192
POKE 8568,33
SYS 4096 

Set number of laps for each player:
Load or reset the game, then execute the following BASIC commands before running or restarting the program. Note: X represents the number of desired laps. Do not set the CPU player's laps to more than three. 

POKE 8566,76
POKE 8567,192
POKE 8568,33
POKE 8498,221
POKE 8499,121
POKE 8500,33
POKE 8569,X+48
POKE 8570,X+48
POKE 8571,X+48
POKE 8572,X+48
SYS 4096