Enfeb affects everything that has a "chance to do _____". Sleep isn't affected by it because the sleep itself gets resisted, thus making it magic accuracy. It is true, the enfeb is mainly useful for the flair DoT, which by the way is pretty sick with the stardust rod.

To be honest, I think these weapons were balanced towards the 2.0 client. I'm mainly thinking this because they said stat stacking isn't going to be as useful as it is now in 2.0, so putting magic accuracy on a head piece may actually be better than putting int. Which is also another reason why I think the Darklight Cowl is currently junk.