I can't answer all your questions but most importantly:
Warfare is much better than Dual Wield, since it is multiplicative damage (unless that got fixed recently).
Also going Warfare will give you the luxury to use physical skills that are not reliant on your weapon scaling, there is quite a few of them.
Dodge is not that good, since it only works against weapon based attacks and not against most skills.
All skilled up can be situationally good since you can respec in Act 2, but it's not something you want in your end build.
Leech is not very strong and generally vit heals in this game are not too interesting because of armor.
A must have talent is Executioner, the 2 AP on kill per turn are really strong especially together with Adrenaline and Flesh Sac.
