I would think omniscience to be the knowledge of all possibilities, the object of free will would be like sitting back and watching what each of us decide to do within that vast array of possibilities.
If we were to look at omniscient, as having all knowledge of all choices made by all people at all times, are you referring to our future choices as well? I would think that perspective would negate free will as there would be no purpose but to act out a play that was already determined... I can't see any logical reason in that.
The purpose of free will, as I understand it, is to prove that we are not merely gods puppets, we have the capacity to choose to see god's ways and learn to love god on our own, not because we were made or programmed to do so.
Another way of looking at this would be if one were to decide to perform an act that is blatently horrific, that is a choice... there is no intervention to stop that action - if that's not free will I don't know what is!
So from what I understand about god and his gift of free will, god may know all, yet will not intervene... as that would negate the free will we were given. In that I find it difficult to understand people blaming god for bad things that happen, when in actuality they happen because we have free will and god cannot intervene as that would negate the purpose of free will.
(Heh... Give 'em enough rope huh?)
Actually just reading back, I really should just agree with
asaris's post above
... omniscience is very much like being the passive observer and in no way interferes with free will (
our actions and choices).