Yea you would need to state what RPM you would want the fuel cut to be. You also wouldn't want to rev much higher on a stockish truck.
You can do 4k on a stock motor. I used to turn my WS/DD truck to 4200 intermittently. Most tuners will be safe, 3500 is very safe and that's where I set them for customers unless they request different in which case I inform them of the limit and the risk.
As soon as I go over stock rpm limiter the waver comes out to get signed, no need to be liable for someone dumbness.:dead-horse-fast2: