Ener the following codes at the ‘Code’ screen:

ALLJUMP   Super Jump Springs
BACKWARD  Throw backward
FRONTS    Throw forward
GOFAST    Rocket Boosters
HEADLINE  See all headlines
INVINC    Invincibility
JUMBLE    Invisible obstacles
LITTLE    Little paperboy
MAGOO     Near-sighted mode
MAXSUBS   Level select 
MOON      Super jumps
NOBUNDLE  Infinite papers 
RUSH      Turbo mode
SCREAM    Screaming obstacles
SIDES     Papers thrown at 90 degree angles
SUNDAY    Big newspapers
UNTIMED   Frame-by-frame mode
WAKING    Slow motion

Thanks to Revolution readers Martin Brodeur, Luis Gaud, super z, Mike, and

Blake Skidmore!