Horrible, no more proc with charge attacks....
How do you expect us to kill mobs to charge a proc, without a proc. Currently you can't kill a mob anywhere without a proc.
And how do you expect this to work in the current expansion, if half of the content is boss-only portals.
Killing streak sounds like the worst idea. For the same reason mentioned above. Not to mention, if you go solo with a war, good luck killing a mob without a proc.
On the other hand, it would be hilarious, to have your proc charged, throw it at the boss and eat a stun or push, as it already happens with the or mini of zodias. Or even worse in the portals, where everything is instakill.
I don't see the slightest control over their weapons, at least in this small advance.
On the contrary, you must have a master mind, to match the charged proc with the ultimate, with the pet skill, with your attacks, while avoiding the multiple attacks, stun, push and instakill of restless bosses.