Yeah, I've seen that it acts funny sometimes if you have some creep adjusted into the radio and turn it on.
Neutral width is simply a dead spot in the trigger at neutral. It's normally set fairly high at the factory (regarldess of manufacturer) because they have no control over how good your radio is. A dirty radio will need more of a dead band to keep it from getting jittery at neutral.
For 13.5 sedan outdoors, I have the neutral width all the way down and throttle profile 3 (I like that feel best). Then I adjust the punch setting on my radio to get the punch off the line (%15 at the moment).