Kirin Strike Criticals & Stacking

[Bladelock]

Kirin strike allows you to add untyped damage to an attack as a swift action after you hit. The damage is x2 the character's int mod.

Question 1
If the Kirin Strike damage is added to a crit, does the entire Kirin Damage get modified or does it follow rule of adding multipliers? For example:

Crit with x2 weapon and use Kirin Strike. Is the damage
Int mod*(2+1)
or is it
(Int mod*2)*2

ALSO

Question 2
Can Kirin Strike be used with a feat that allows Int to be used for damage rather than strength, such as Elven Battle Focus?

[Moonclanger]

In answer to Question 1, I'd say the critical multiplier applies to all the damage, if for no other reason than it keeps the maths simple. So, if my damage bonus from all sources totals +10 then on a x2 critical I would expect it to be +20. Anything else would just slow the game down.

[NopeDK]

1: It would be Int * 4 total, you add a static bonus equal to twice your Int, it is not a multiplication effect like critical hits, lances or spirited charge.

2: No, as per FAQ http://paizo.com/paizo/faq/v5748nruor1fm#v5748eaic9sgk

[Bladelock]

NopeDK wrote:

1: It would be Int * 4 total, you add a static bonus equal to twice your Int, it is not a multiplication effect like critical hits, lances or spirited charge.

2: No, as per FAQ http://paizo.com/paizo/faq/v5748nruor1fm#v5748eaic9sgk

I thought this might be the case but wasn't sure if Kirin really applied to that FAQ.