This is actually for 2 improvements around the same feature (equipment).
1) Have a way to lock or unlock gear. This will prevent the accidental sale of mythic equipment that people have spent time and effort to upgrade. If this isn't possible, I would at least like to have an additional confirmation if selling a mythic item above level 1.
2) Adding a filter to the equipment page, similar to the Harem page, where items could be filtered by rarity or effect.