slew rate is not traction control, it is what it says, a slew rate for rpm. and yes you can run it with nitrous as long as stupidity doesn't take over, I would not recommend you running any nitrous through that motor until you are familiar with the workings of the dig-7. it can be tricky but in the long run it will be a better piece. as far as cranking issues , recheck the settings in the tree to verify the settings are where you left them. the7530t is a traction control detection box and if it sees an odd change in timing ( such as cam walk with a msd coventional distributor) it will retard the timing permanently. the only way to clear the code is to leave the ignition on for a 24 hour period. go to msd's website for more questions regarding this( forums). if the adrl pronitrous promods all run the 7531, shouldn't you.