I have a suggestion for this, it sometimes feels hard (especially at the start) to memorize which mobs you gonna kill, and which you gonna pass, is there any way someone can implement a marking for the mobs that are in the route? So you know that you have to kill marked mobs, and avoid the mobs that aren't marked.

To my knowledge, this is not possible.

Good news! We are currently investigating a very similar feature. Check out issue #40