Never seen O2 switch points on any V6 cars. V6 trucks have that table. The V6 truck is just like the V8's. Since I do VCM tuning as part of my auto repair business, my WB is just on the car for the day I tune it. My experience with lowering the O2 voltage switch points have little affect on the closed loop AFR.
And changing the stoich AFR has no effect on the closed loop afr, leave that at 14.7 or it will affect the commanded AFR.
Yes you can also command open loop with the scanner.

Russ Kemp