I was actually planning on adding that as a normal feature but then due to lack of time, I gave up and chose to choose this as my explanation for not adding that: "Trash Trucks usually get assigned the houses and areas they are meant to go to beforehand, hence why they ignore new trash".
But yes, since I am done with the submission time and stuff, I can finally work on improving it! I love your idea of adding it as an upgrade instead! Will work on it soon and I will also name it "Better Routes" in your honor! Thank you so much for your input <3