Hey HOJO. The answer is no, and yes. I have never found a way where you can adjust the competition mode launch limiter. Typically, you would not use competitive mode at the drag strip, you want all the "nannies" off (7 second long press and hold on the traction control button). With everything off, there is still a limiter that will hold the RPM to 5,000rpm, which may not be enough for a stick shift car. This limiter is based on wheel speed. This can be changed with HPTuners. I actually have a decent video example with a screenshot of the table.
https://www.youtube.com/watch?v=2dI6dW2uHGw
Let me know if you have additional questions.