Do you even know what a 2 step is? 2 step (as far as i know) works in 1st gear when you are at a dead stop only. Its for launching and launching only. It's mainly for awd cars, or anything with sticky ass slicks on it that can actually hook on a launch. NOT for a drift car.
If you want a rev limiter, your ecu has a rev limiter. If it doesnt, then something is wrong.
I'm willing to bet you will eventually get a standalone anyways and then you can set the rev limiter to whatever you want.