Vel'Koz Ult quality of life change suggestion

I really think they should change how Vel'Koz's Ult works.

1. It should be a toggle-able ability that charges up over time.
2. I'd also like to see it split beams like a fractal tree after hitting targets, doing lesser damage on split beams. (His Q splits beams why not this?)
3. Since he has no escape a slight pushback on his ult might be nice.