Outer rim pioneer coordinates my Starviper to boost giving a focus and stress. The Starviper in own move does a forward 2 - removes stress and the barrel rolls, can it receive a 2nd focus or is that a double action which it cannot do in the same move?

That would be a second focus action in one turn, which wouldn’t be allowed.

Linked actions are still actions.

3 hours ago, Opsmason said:

That would be a second focus action in one turn, which wouldn’t be allowed.

Linked actions are still actions.

This is correct, see Rules Reference (1.0.2) page 3 where it says this: "...a ship cannot perform the same action more than once during a single round, or perform an action it has failed this round."

And on page 12 the definition for Linked Action references back to Action .