In my opinion, the NSX's front end washes out much too prematurely than anything else I've driven in quite some time. I think Honda dialed in too much understeer that even a inexperienced driver would have a difficult time losing this car.
In so far as changing tire pressure to adjust handling; I've never liked this idea. I played with my tire pyrometer a lot to tune this and in the end I decided that it wasn't worth it. In essense, to make the car more "neutral" you make the front tirepressures ideal, and make the rear tire pressures somewhat off. This seems like you are just giving up overall performance for the sake of neutrality..
I have to pleed ignorance on the topic of NSX tuning; but I believe that the stock suspension is tunable to some degree..
Is the rear sway bar adjustable?
Is the front camber adjustable?
Either of those could make a huge difference...
-Jeremy