pin 7 mod does not effect shift points, pin 19/9 mod does, the earlier method of unplugging the plug on the transfer witch did affected locker operation and shift points
Without the pin 7 mod the switch gets you locking/unlocking of the center diff lock in high range only. It will still lock on its own when you shift into low regardless of cdl switch position.
pin 7 mod interrupts the 4-low signal to the locker ecu preventing it from locking the center in low and you now have full control of center locker with the switch in high or low.
If you want more info there was a very recent long thread on this that gets deeper.