Let me see if I can explain myself.
First of all, I agree with you that probably RAI is that AP-5's ability only applies to one action.
But I want to see if I can define the relationship between Steps that say "perform one action" with linked actions. This should give us a better idea of the limits of a "While ____________" trigger.
So I asked these 2 questions:
-The Perform Action step specifies only one action. After a ship performs one action, is the step finished? Are linked actions part of the step or outside of it?
-Step 3 of Coordinate specifies only one action. After a ship performs one action, is the step finished? Are linked actions part of the step or outside of it?
I believe the best answer should be:
(H) -> Once the ship performs one action, the steps ends. All linked actions and effects lie outside of the step.
The FAQ entry for Lt. Sai seems to uphold this answer. But I have a problem with the particular phrasing of the Ionized FAQ:
"Q: Can an ionized ship perform an action that is linked to its
focus action after performing its focus action?
A: No. Focus is the only action that it can perform during the Perform Action
Now, this FAQ clearly implies that the linked actions are part of that step.
--Does this applies to all Steps that say "perform one action"?
--Is the Perform Action step a special case that ignores (H)?
--Is step 3 of Coordinate a special case and only it follows (H)?
I don't know!
As for your last question:
I agree 100% with this post: