>1) Could you elaborate on AP bloodlust, Ragers bloodthirst and
>muter accelerate?

Bloodlust is haste-like, with some differences. It includes getting hungry/thirsty faster, a bonus to HP regen while fighting (otherwise a penalty like other forms of haste), and at higher levels the ability to take limited attacks at other people fighting you.

Bloodthirst grants haste at higher levels, which functions exactly as haste.

Accelerate is not haste; it is a separate spell with some advantages and some drawbacks. The drawbacks become much more extreme if stacked with a form of haste, but can be alleviated up to a point by the metabolic unity skill. Situationally, a transmuter would be wise to accelerate a hasted opponent to use that haste against them.

>2) Quickness spell is just +dex, right?

Right.