See a very good post in the archives Chapter 12 "12-5-0 The Basic Motion Curriculum"

From this, per Yoda:

"As stated in 12-5-0, the items in each of the Three Stages are meant to be
interpreted per the Stroke Patterns of 12-1-0 (Hitting) and 12-2-0
(Swinging). In other words, if you are learning to Hit, then the Right
Arm becomes active, and Pressure Point #1 becomes its Direct Drive. If you
are learning to Swing, then the Left Arm becomes Active, and
Pressure Point #4 becomes the Direct
Drive. "

I wouldn't be afraid of feeling a lot of activity in the hands, hit or swing, basic motion or full stroke. Positions of the hands may be frozen, but you are very, very busy actively sensing pressure.

So how does a swinger activate PP #4 in basic motion?

Of course it won't accelerate the beginning of the down sroke as in a full stroke but any left arm motion is acc#4 in Basic Motion.

A student should be able to do basic Motion as a Hitter and a Swinger and do all Hinge Rhythms.

Acquired Motion begins the addition of a weight shift, Acc#2 with the wrist cock and wrist roll into follow through.

At first, it is far more important to learn motion and geometry from Basic Motion than how to activate power accumulators.

See comdpa's post (earlier in thread). See also where this is referenced in the referenced archived post.

First question: Yes, although you may want to consider the wisdom of so many things moving in such a short stroke.

Second question: No, you are using extensor action per 6-B-1-D

Thanks Slinger!

When reading 6-B-1-D he says "...use #1 pressure point and pull on the left thumb..."

The #1 pp is to the side of, or rather behind the thumb. I can only see pushing being the action. What is meant when he said "pull"?

You are pulling the left arm via the thumb with pp#1(right handed)-extensor action.

Aha, pulling the arm via the thumb by pushing with #1PP.

Yes - in the direction it is pointing toward the ground, NOT at the ball, unless you have zero accum #3 (no angle between the left arm and club). In nearly all cases, you will have some amount of accum #3.

Extensor action is a stretch 'below plane'.

if I may add:

Below the Plane of the Right Forearm not the tugging inline plane of the Left Arm.