No cheat codes unless they're in the manual is part of the rules. The rules could be changed next year or at some point, but those are the current rules.
I would recommend using warps if you're trying to 1cc Kung Fu Heroes. No sense completing every stage unless you're really into that game. Most of the difficulty is at the end anyway.
EDIT: I remember one year that The Mexican Runner's completion of Kung Fu Heroes was disqualified because he used continues. TMR still considered it legit for Nesmania because he figured out how to continue for himself and nobody told him nor did he look it up. TMR beat other games such as Ikari Warriors without using any cheats.