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You take the seating plug out of the seating die and set it up in the taper crimp die. Works just fine.
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Take the seating plug out of the seating die and "set it up in the taper crimp die"? I don't understand. Why would you put a seating plug in the taper crimp die? Or did you mean remove the plug and then use the die for taper crimping?
As long as the bullet has sufficient tension, you can get by with very little roll crimp. If the bullet has a cannelure (crimp groove), the roll crimp can be crimmped into the groove enough to help secure it without being enough to hurt accuracy IMO. Not sure how much a heavy crimp affects accuracy.
Most factory ammo is well crimmped-- especially in heavy calibers, and accuracy can be quite good. Unless the bullet is damaged by the crimp, the bullet should be ok once it enters the bore and gets to spinning. When loading low recoiling .38's, I roll crimp very little, since there's no chance of bullet setback from recoil.
I just started loading .44 Spec. and the Dillon taper crimp die is designed to impart a slight roll crimp, also.