First you will have to make the tome non-acquireable when picked up. There is an option in the OE that change that, the point is to disable the instant effect of the tome and make it like any other item, after that you need to trigger the tome, so whenever it's picked, you can simply remove it or drop it (You could use Item-Type in this case). Now as for the other situation, the bonus depend on the ability of that tome. It's all configurable in the Object Editor.