Why can't we bind items from our inventory to our hotbar?

Question

The need to manully switch between weapon and healing items while fighting the aggressive creatues or whilst getting gassed to death is really frustrating :)

Comments

There needs to be four hotbars. Three for build menu items and one for inventory items. Can use shift, ctrl, and alt keys to control which bar you're accessing when you press a button. No modifier key held, you're accessing your inventory item hotbar (weapons, healing items, etc). Holding shift, ctrl, or alt accesses the 3 different build menu hotbars.

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Agree; items are way too hard to switch.  I was thinking there could be 4-6ish special inventory slots for items, and you could swap them with f1-f6.  More importantly, you could use the mouse scroll wheel to progress through them.