Select each consumable you wish to track in the custom options tab. Also don't forget to set the load conditions to w/e you wish. Per Default it is shown everywhere on every character.
Consumes are either highlighted if they're completly missing, or if their duration is <60 seconds (<180 for weapon enchants).
Contains (almost) all BiS consumables. Let me know if you want me to add suboptimal ones such as elixir of giants.