hi,
u can do indeed a bit micro.
For raven (or all other units) theres a "checkbox" in the upper left corner. If u click there will appear a menu with an overview of ur units.
Klick on raven - and u can deactivate or activate skills. For example: deactivate missile so that turrets kill all lings, and then activate missile to kill roach or other units.
HT: u can micro storms a bit, but imo its not good to handle manually. Think, ki does a better job than i can do per hand - imo.