Hey, don't look at CS. If my theory is true and the bonus only works for one strike, the real loser is Power Attack.
And remember that this is an RPG, not an MMO. The developers of these abilities (Bioware) also made fighter abilities for Baldur's Gate II, and believe me, they are not equal.
(But that's hardly on topic, as it doesn't answer any question)
I know that I prefer to give Mandalore a Mandalorian Heavy Repeater and I'm pretty sure I never see more than 2 attacks. Don't know about pistols, as I make people dualwield if they can.
Okay, post-testing (cheated some more XP to my final save to explore the previously unlearned feats, also some constitution to survive a game where Kraya can do 350 damage criticals):
Critical Strike:
Two attacks connected. No critical hits (though that doesn't say anything), but Kraya had to roll against con exactly once - not twice.
A second test with Master Speed gave me 2 criticals, on the rolls of 17, and 13. So I guess you're right. The Crit Range modifier applies to the whole round.
Rapid Shot (one pistol): 2 attacks (and no hits, but no surprise there)
Flurry (one lightsaber):
2 attacks.
Edit: For anyone wondering: Yes, I used the Master version of each of these feats. I simply shortened their names because I couldn't be bothered...