I've been playing on and off since ARR and it was never a feature and I am rather surprised it hasn't been added at some point over the years.
Quality of Life change; please add buff sorting to the focus target monster, with as many debuffs as players have at 70 most of the debuffs i apply get scrolled off and force me to glance at an unnatural part of my screen to keep time. Just make it sort in the same way the primary monster bar does, my debuffs, then the party/alliance. Itll make things much more ergonomic and streamlined for many classes.