Figured I would put this here as it's a fairly useful bit of information that was announced today:

It's no longer possible to defensively benefit from holding a runestaff and a shield at the same time. As a one-handed defensive tool, you can still benefit from the shield in such a scenario, but the runestaff will not be able to be used effectively.

GameMaster Estild
http://forums.play.net/forums/GemSto...hread/1883386#