How is the bonus ranged damage (+2 damage) added with this perk in F1? Say, you do 10 damage and happen to score a critical hit x3. What will the overall damage be (before armour/resistance modifiers)?

1. (10+2)x3 = 36
2. 10x3+2 = 32

It's the latter. Having this perk prevents you from doing 0 damage criticals (you'll always do 2 damage).