Hello! Thanks for the answer!
I knew about the Goofers, but currently the rest of the dupes are *way* too slow (unless they come with athletics levels) already.
I could get this change to motivate the usage of the tubular system, but not when your constructor spends half a cicle to get to a single tile down the petroleum area to walk back up again :D.
Now, I don't know if leveling Goofer would make them retain those Athletics after swapping back again to a constructor. If so, that would be "fine".