First, I have to say that I do not want something like this implemented without it being an option that people can turn off, because I am positive there are people who either A) won’t like the idea, or
don’t care for the distraction.
I’d like to seen an audible notification implemented for when food/utility buffs time out. Visually they flash for like the last 10 seconds of their lifespan, but it simply isn’t enough to really grab the attention. A mild, audible tone of some sort that chimes when the item times out would be useful.
It is possible it could be applied to banner buffs as well, but I’m not sure if that would get overboard, but having something audible would be nice, as the visual notifications often get lost if you are in combat and carrying boons/conditions and so on.