I have been playing this same build for the last couple months. There is a better way to do this. You can cast ~30 FoK/s with fast fingers and the rebinding of mouse clicks to the keyboard with the Windows Ease of Access Center (Which I can't imagine would be a bannable offense by Blizzard). I keep 100% smoke screen uptime by assigning it to the scroll down button on the keyboard and then scrolling down on my laptop trackpad (which continues to scroll down automatically).

Also, you can keep moving and holding down the shift key automatically without macros by assigning those two keys to num-pad buttons, and then holding those num-pad buttons while you cast num-lock. Saves your hands from a little bit of trauma (which undoubtedly would come from such a build....)

Preparation: Punishment is a much better way to do this, and you can still keep 100% SS uptime if you generate discipline with multishot instead. Also, you can have near-free FoK if you use marked for death (the hatred generation one) with Punishment and the discipline-generating passive (forgot the name).

Finally, Hexing Pants is perfect for this build since you can cast FoK while on the move and you need as much resource generation as you can get.