I think SCT also offers tuning for Magnums but its at least as expensive. The previously mentioned crank sensor mods would help.
I personally can believe the performance gains offered through a tuner for the Magnums, stock they are total pooches. I've had two of them, a 95 ext cab sb, and a 96 ext cab long box and both were gutless, like 0-60 times in the 12 second range (going by a stop watch), for comparison my 05 HEMI QCSB 4x4 (at least a few hundred lbs heavier) does 0-60 in the 7.8 sec range. The Magnum motor itself is good, look at the performance guys get out of stock engines by simply swapping to a distributor and a carb (talking engine swaps here), IMO it's from a decent timing curve. Also, look how fast the 92/93 Dakotas were with the original timing curve, yes alot lighter but c'mon, it doesn't account for the poor performance from later years