Hehe, thanks
I have very very rarely had peeps puke/litter in my queue lines, maybe not even a handful of times. So I see no reason for handymen to enter queue lines. Make it an option like when selecting their duties to have them avoid queue lines.
This is just a rough example of the issue you can run into with the 4x4 grid selection of the patrol paths. This could obviously get more annoying if you say have queue paths above the blue selection as it gives them another chance to not walk along the normal footpaths. From my experience it is more than likely that your handyman will love to join the peeps in the queue rather than walk along on the normal footpath.