Idea to avoid Rare Backtracking

Havent seen this idea anywhere, if its already been suggested great, but easy way to lessen the need to backtrack is to have rare show up in mini map (the way they do now when less than 200 mobs) when you run into them given they dont glow like in POE 1.

Too often ive left a rare mob alive without even noticing just because I didnt know it was there because i didnt hover over the right mob.

Thoughts?