Some small items are too far away to grab

For some items the world collision does not allow my character to get close enough to grab them.  Early examples I've run across are the goblet and coins in the hollow tree by the Seyda Neen lighthouse, and the chest key in the Thelas Ancestral Tomb.  I can disable collision to grab these items, but I'd prefer a better solution.  Is it possible to increase grab range by ~5%?

Edit: Ah, figured it out!  It's controlled by the game setting iActivatePickLength