You would have to file a new detent spot in the shift rail at the sweet spot for neutral. The m/t gen1 trucks had one, IIRC, but you'll have to do some tear down to locate your spot. Try taking a look at the manual on tcase removal and teardown to locate the right rail and the detent ball location required. I'd get the rail in the sweet spot, pull the detent ball, spring, and cover, and use a punch to mark the rail at that location.

Not responsible for advice not taken...