[Kristoffer O]

There are two kinds of quickness, code-wise (IIRC). I think it works like this:

FX_quick and BEN_quick.

BEN is an enchantment and gives +3/+3/+100%. Spell and items give BEN_quick. You can only have one BEN_quick on you.

FX's are other quickening abilities. Heroics, blessings etc. It is a varying value that adds. It does not give att/def. The heroic starts at perhaps +25% and might get higher if you stay on the HoF. Blessing gives FX_quick 50%.

So with heroic +77%, water blessing +50%, boots of quickness, you would get +227% move and actions and +3/+3 att/def. You could not increase this with a spell, since you already are enchanted by your boots.