Agreed on that overman, it appears that in any room with height greater than 2 they choose to fly. It would also conserve fuel and reduce CO2 levels.
I started a new colony without jetpacks and with pathing limited as much as possible, and I am now closing in on cycle 400 and still maintaining 60 fps. However, there must be a memory leak or something, because I have to restart the game every 4 hours or so due to at the 3 hour mark the frame rate starts steadily dropping.