I'm indifferent with knowing kill counts on mobs. I can however see it being discouraging to some people when seeing your lack of RNG, or comparing with others.
I don't think DPS should be implemented. It brings out the glaring flaws that the game already has with balancing issues and makes them more apparent than they already are.
I could care less about EHP, it's already calculable and the information is already there if you want it.
Roll is a cool concept but Arnah already addressed this.