I know that you have mentioned it would screw up your form but could you explain exactly what gets screwed up.
Yes, I' d like to know that also. By modifying the grip as DeerT has mentioned in order to get a longer draw, you would not change your anchoring point, or change the angle in you bow hand. Basically, you would have to make the grip with a greater amount of material (distance) between the riser and the hand. About the only thing that I can think of that this may amplify would be if there was a torque problem to begin with.