I've been playing Skyrim for a while now, and still have not figured out how to properly create a hot-key to my dual wield setup. I've tested with spells, which easily allow you to select multiple spells or dual wield the same spell. But with weapons, if I use my hot-keys to switch to a spell in my left hand, and then afterwards, hit the hot-key for my weapon, it just swaps the weapon I have in my right hand, keeping the spell in my left hand. It makes it very annoying to harvest souls, as I have to open the Quick menu each time, and manually select it in the proper hand.
What works for me:
- Favorite the weapons
- Equip them in the proper hands
- Assign a hotkey only to the one in the right hand
Now, only hit that hotkey when that's not already the equipped weapon, and you should get both.
If you do accidentally hit the hotkey when the weapon is equipped already, sometimes you'll end up de-equipping the left hand weapon; just hit the hotkey again to re-equip it.
The only scenario in which you can do this is if you have two identical weapons. Remember that the goal is to be able to switch to your dual wield setup, and that using a spell when dual-wielding will always start off in the off-hand (hitting it twice will dual-cast it).
If you have two identical weapons (so they get listed as Glass Sword (2)), you can set up a favorite and link a hotkey to them. Hitting that hotkey twice will dual wield the weapons.
Hopefully they'll address the ability to fully hotkey dual wielding at some point.