Maybe this is already known, but the quick keys are really messed up.

1. I want to use Bound Sword, normal shield, normal bow, and Summon Atronach. I add all to Favorites.
2. Set BS to 1 key, shield to 2 key, SA to 3 key, bow to 4 key.
3. I want the BS in right hand (for left mouse button), shield in left, and SA spell to appear in left hand (right mouse button).
4. Everything seems to work okay UNTIL I press 4 for the bow. When I then press 1 and then 2, I get the shield in left hand
but SA in right hand instead of BS. If I press 1 again BS comes up in left hand.

Anyone else having endless problems like this? It also doesn't help that the SA and BS spells when in hand are identical in appearance.

I have similar problems when dual wielding weapons. I don't know how to 'permanently' assign a spell/item to a specific hand.