Those are all points that I was considering with a 1 second Cast. It would be so that you can't just run freely like 2.0, but might alleviate some of those other issues, mainly the SS proc, Repelling Shot animation delay and possibly fitting in 2 oGCD without issue if you have good latency. (0.5s delay per oGCD?)
This would be an awesome addition. <3 Pre-Planned burst. Could you imagine A2S if you were stock piling your Procs for the large AOE sections....reworkin river of blood to give a stacking buff that increases BL damage or something.)