NBA Hangtime Codes:

'Duplicate' Players

For all of these input the pin number as '0000'

Ahrdwy (Penny Hardaway)
Cliffr (Cliff Robinson)
Davidr (David Robinson)
Dream (Hakeem Olajuwon)
Elliot (Sean Elliot)
Ewing (Patrick Ewing)
Glennr (Glenn Robinson)
Ghill (Grant Hill)
Hgrant (Horace Grant)
JC (???)
Johnsn (Larry Johnson)
Kemp (Shawn Kemp)
Kidd (Jason Kidd)
Malone (Karl Malone)
Miller (Reggie Miller)
Motumb (Dikembe Mutumbo)
Mourng (Alonzo Mourning)
Mursan (Gheorghe Muresan)
Pippen (Scottie Pippen)
Rodman (Dennis Rodman)
Rice (Glen Rice)
Smits (Rik Smits)
Stackh (Jerry Stackhouse)
Starks (John Starks)
Webb (Spud Webb)
Webber (Chris Webber)

'Sectret' Players

For all of these input the name and pin as shown

Bardo 6000
Divata 0201
Jamie 1000
Eddie 6213
Jigget 1010
Munday 5432
Nfunk 0101
Shawn 0123
Amrich 2020
Carlos 1010
Daniel 0604
Eugene 6767
Japple 6660
Jason 0729
Jfer 0503
Johney 6000
Kombat 0004
Marius 1005
Marty 1010
Mdoc 2099
Mednik 6000
Minife 6000
Morris 6000
Mortal 0004
MXV 1014
Nick 7000
Nobud 1010
North 5050
Patf 2000
Perry 3500
Quin 0330
Root 6000
Sno 0103
Turmel 1322

VS. Screen Codes

461 Unlimited Turbo
025 Baby Mode
111 Tournament Mode
273 Stealth Turbo
284 Max Speed
552 Hyper Speed
616 Max Blocking
709 Max Steal
937 Goal Tending
390 No Pushing
048 No Music
120 Fast Passing
802 Max Power
Big heads UP, Pass, Turbo at once
Huge heads Up, Up, Pass, Turbo
Shot percentage Rotate clockwise
No drift Down, Down, Pass, Turbo
No CPU Hold Right, Pass, Pass
Red, White, and Blue Ball Hold Right, Shoot, Turbo, Pass
Rooftop Jam Hold Left, Turbo 3x's

Misc. Codes

At the team selection screen, hold Turbo and press Up. The teams will quickly scroll by and then stop on a random selection. You can then proceed to select the player(s) you wish to play with.

When you select your team go to the Chicago Bulls. Get Rodman up on the screen, then press PASS to change his hair color.

By far one of the best options in this game would be the create player option.