I believe the cookie cutter spec does not take bane, in order to take 2/2 mana feed. Something like this:
http://www.wowhead.com/talent#IrGr0hsGcdcbbZc
To stack SE quicker, you can just precast your first shadowbolt during the pull countdown, then simply use haunt to finish stacking it.
If you want to take soulburn:seed of corruption then as far as I know your best bet is dropping one point in Pandemic, and just being ready to referesh UA during executes occasionally. Personally I'm sticking with a shadowbolt spec.
nochanelling macros require low latency. A large latency will basically manufacture a pause between your casts.