Completely false. I had a gun with one (never used it, mostly because I forgot the activation sequence, but I was able to select ramping or F/A and even define the ramping parameters so it looks like I have "fast fingers") and several aftermarket boards can be programmed to give you a cheat-like effect.There is no such thing as a "cheat code", only preset modes. I've used most guns and boards, so know how they work.
There is currently no market for cheater boards as with 10.5bps ramping it's very easy for pretty much anyone to spot a gin firing faster. You take away that bps restriction, and you'll single-handedly create the market for cheat codes.