Dagger questions

Mutilate talent on rogue, how does it help if i put it on my rogue? It says x% chance to have an additional time with daggers, if my memory serves me right, what does that mean?
One more question, is attack speed needed on a dagger build? Im assuming it doesn’t, coz quickattack already have a fast attack speed.
Lastly, if multi attack boost chakram damage (which I knew from a chakram thread) does it boost dagger damage too?
I just need answers on this to have a clarification and peace of mind.:smiley: