TK eating issues; accidentally targeting mobs in clustered fights.

Am I missing a mechanic/hotkey or is it basically just luck when you quick cast "w" on a stack of targets?

If so, then how about making minions require 1 stack to eat? I don't see it being an issue because "q" gives you that stack at range, and in melee you can just AA eat a minion no problem. The main idea being that it'd make TK a lot more reliable when a 3 stack target flees into a minion mob. It's quite annoying to miss a kill, or lose a team fight because he decided to prioritize a 0 stack minion over a 3 stack champion.

TLDR; I would like to see improved priority of TK's devour during team fights / fights in minion waves, where valid priority targets may be stacked on/around non priority mobs and minions.