For disc 2, it allows it to play without first inserting disc 1.
For disc 1, it allows it to play without require a switch to disc 2.

Modify word at ISO location 0x786 to be anything except 0x01FF (I choose 0x00FF for my testing).
  fahrenheit_no_key_hack_bin.ips

Location 0x796 for for the BIN of a BIN/CUE image.
 fahrenheit_no_key_hack_iso.ips
