My hotbutton box has a column added to the left hand side for inventory/equipment slots. The top slot is the "armour & weapon" bag that is always open right beside it (allows me to open the bag without having to open my inventory every time I zone). The next 4 slots are equipment slots that I am either swapping in and out, or right clicking (or both). The bottom slot is an open inventory slot, good for dropping foraged food/drink into, or (more importantly) a great spot for holding mod rods until it's time to drop them before the fight.