YPJT, I am with you. This is a step in the right direction.
Captain Midnight, I disagree.
In my experience, bashing around the bush, refuellers would love the chance to avoid abuse by saying "No Avgas here". In my experience, the attitude you subscribe ("if you want fuel, phone, don't just lob up") to refuellers only pops up:
*During after hours call outs, where numptys rock up without notice and expect the red carpet.
*The pilot who turns up and (for whatever reason) take the bare minimum (the pilot who took 17 litres at Marree springs to mind. The result in this instance is the refueller doesn't cover the cost of starting the truck or driving out from town.
I disagree, strongly, with your comment "Some will adopt the practice, others won't want the responsibility". Desert Flower (and others) will attest that refuellers already hold a considerable amount of responsibility, and so the issuing of NOTAMS will become just another part of the job.