According to the official developer notes from VRESKI on Steam, this specific version introduced:
If you are looking at a file with a .rar extension from a third-party source, be aware of the following: The.Hong.Kong.Massacre.Update.v1.03.rar
: Introduced the option to use a hardware cursor, which typically helps reduce input lag for aiming. According to the official developer notes from VRESKI
: Added the highly requested option for players to customize their keyboard and controller inputs. The.Hong.Kong.Massacre.Update.v1.03.rar
