I would suggest hauling enabled only for selected, and select all (or almost all, see below). Once you need something done in bigger quantity, like engraving slabs, disable the hauling for the dwarfs you need for the job. After some time you probably will settle on a particular setting and won't touch it again, or for long time.
Now, I suggest disabling the hauling from the beginning for dwarves who have a particular fondness for items you want for specific purposes, like trade. That is because haulers of items which they have preference for will occasionally "acquire" this item, owning it, and making unavailable for other jobs from now on. I have hauling disabled for coin lovers, for example.
Regarding the priorities, dwarves don't wait for suspended job before doing next one, but the item needed for that job is RESERVED for it, and won't be used for another job, unless this first job is completed or cancelled.
Whether they do something or not is not depended on any order on any list, but on priority and distance. For example dumping close is done much faster, and with high priority, compared to dumping items located far away (which can be selected by job scheduler, not picked up by a dwarf, and dropped, only to be scheduled some time again later).
Also, if you have ghost problems, I would suggest forgetting coffins for now, prioritising engraving and setting slabs. You can create zone over a coffin later, and even if the corpse is a skeleton, it will "claim" the zone and then some dwarf will bury it.
I prepare rows of coffins early in the life of the fortress, with space set for future slabs under each coffin (rooms 10x10, but 50 coffins in each), and enable a 1x1 grave zone on a first coffin in a row. When a need arises I create a second zone, or further ones. Slabs are technically not needed then, but I think them a nice touch (they tell who the deceased was, for my citizens). Other set of rooms is reserved for each historical figure which is not buried (like invaders or my war animals with kills, or forgotten beasts). There I set slabs for them. If I was overwhelmed by deaths, I would create and build slabs first, and then build the coffins in the reserved spaces.