I should start jotting down all the ideas I have for addons when things annoy me in the game in the event that they'll be possible with whatever API SE makes available to us.

Aetherytes always take top priority on the map and their icon + selectable/tooltip area are always placed above any other type of icon.
Mini-aetherytes in towns/housing are labeled with their aethernet names instead of "lol magical rock".
Currently revealed unspoiled nodes and in-range standard nodes appear on map.
Gathering nodes given 2nd highest priority next to aetherytes.
Distance from current target.
Party TP
Prevent using Virus if Virus or Antibody are present on target.
Prevent using Eye for an Eye on target if already present.
Double-clicking a mat in a recipe will jump to that mat's recipe, if it's a crafted item. (forward and back buttons as well if possible)
Remove auto-addition of recipes to Favorites.
Clicking a quest/leve in your tracker that requires crafting opens the crafting window at the recipe of the item you're supposed to make instead of the map.
A notification window that reminds you when a given unspoiled node has just become active.
Some sort of automatic FC message equivalent of the same, so that when a node goes active it tells everyone to go grab a Grade 3 Thanalan dirt or whatever else the FC needs to be stockpiling.
Try-on and Search for Item via right-click in the lotting window.