-Fear: lingering/dependant. What determines which one I use. I take it dependent would be from a creature causing fear/terror as the cause is still there in front of the player.
Of the two different "Frightened" cards to use, always use the one that says "Lingering Effect". It's from one of the reprint Vault products, and is actually a replacement card that incorporates important errata. The older version had ambiguous wording that could be interpreted in at least two functionally-different ways, but the Lingering-version reprint fixes that with much more precise language. Feel free to throw away the older "Dependent" version, as it is in error.
As for more boon/bane effects, the Player's Guide has a new (at the time of publishing) section on "freestyle boons and banes" that's not in the boxed set.
None of the sets has a perfect mix of standups, I'm afraid. The Creature Vault has a lot of good ones (and I recommend it), but not really in the correct proportion that would be useful. Many of the henchmen monsters (snotlings, zombies, ungors, etc) are in short supply unless you buy multiple copies of the same boxed set (which I don't recommend unless FFG puts them on sale again this winter).