Agree with a lot of these, particularly the ones that prevent misclicks (changing the data "underneath you" when you have something else selected, or "enter" do

Agree with a lot of these, particularly the ones that prevent misclicks (changing the data "underneath you" when you have something else selected, or "enter" doing something unexpected). However, strongly disagree with the sorting and preference guidelines. In general the autocomplete should match the intention of what the user is trying to accomplish which is going to vary widely depending on context. Sometimes that's the shortest lexical thing, sometimes geo matters, sometimes recency of usage matters, etc.