Staff is STR STR INT, Which makes sense as Staff is a 2 handed weapon. The WV should be a tad higher though, You should be able to hit harder as there is more motion + length + weight involved. You also lose the ability to have a torch which is a deal in early stages, so yeah that lack of light should reflect in something extra, like more damage on melee hits.
Staff is modded by IAS unless there is something different in this version. Changing is to int/str/str could work, or possibly even IWS. I have no idea what Horo is talking about in terms of removing parry capabilities, is this another new unexplained mechanic?