The default is the same for each type of labour or equipment (no matter the city). If you want to customise it you can do so by entering the Suburb or Town of the Service Provider once an item is added to a design (or indeed in the template library).
I’m not sure how splitting the effort between several workers would decrease the number of trips (unless they live in the same house and car pool?). Let me know if I’ve misunderstood you there. The calculation does take into account the hours worked in a day and different types of labour or equipment have different set points. Very heavy equipment it would be assumed would stay onsite between days (eg pile drivers etc) whereas light equipment / or labour would be moved offsite every 4-8 hours of effort.
Hope that makes sense.