Well, works for me like this, you got the fixed bar which is F7, there you will have basic character skills (sneak, traps, weapon skills like enchanted arrows if you use bows, and knockdown if you use meleee, etc, and 3 slots for MAIN spells (which can use buffs) and the last 2 slots are intelligently used for anything that can restore life and mana, the weakest pots go first, like a piece of meat that restores 50 life, then a bigger that restores 250 etc, same for mana potions.
As for F8 till F10, you have to drag and drop your preferred traps and skills DIRECTLY. The only difference with spells, they can only be added to it AFTER you assign them to the 3 slots on your "quickbook", and yes, buffs will not work on them. After you assign the spells on your book, you can take them out and get the ones you use the most back, and they will not disappear from the quickslots.

OMFG ... thanks for the answer ... that's plain rediculous. How am I supposed to be a swift magician if I have to work like this?! :D