A few questions

1.
Me and my friends were talking about burg crits and one of them said he was able to do 4k crit every time with aim from stealth i said that it probably it was possible but then it was bugging me-could really do a 4k crit every time from stealth with aim WITHOUT LiE.
2.
Legendry trait
I'm thinking of getting the quite knife legendry trait and i need a bit of help knowing if its worth it or is it just better to get the legendry trait from the gambler???? I would like to know what you use and why. (btw i don't want to use that trip re-ducing cool down cause its not much and that is useless) Also about that trait (quite knife) -which skills does it reduce the CD of is it just faint attack or is it others to??
3.
Mace, Daggar or Sword
As i'm a man i get the sword bonus (2% sword damage), as a burg you get 2.5% damage with daggars but with maces you don't get anything but you can slow people's run speed down (which can be useful). What do you use and what.
4.
Can somone give me the link to the possible add ons from LI (like the pool A/B upgrades!