QUOTE (BishopMcQ @ Feb 4 2009, 05:00 PM)

I would tend to say no to Spell Knack for any critter that has a Magic attribute. Per normal CharGen, the only way to get a Magic attribute is to take one of the qualities listed in the Spell Knack description. By choosing a Critter option out of RC, you get the Magic as part of the race.
The intent behind Spell Knack (by my interpretation) was to allow for a mundane who had figured out one trick and while it wasn't as powerful as a mage, could be the edge needed against another mundane.
Edit: If you want to use the last option, take Magician and Aspected Caster (Spell Category). You will have full power with one area of magic and take a heavy penalty on the others.
I see where you're coming from, but i wouldn't disallow Spell Knacks for any of the new character options for those reasons (unless the character is a wendigo, making him a magician or mystic adept by default).
As i see it, Spell Knack is kind of like a step inbetween a mundane and a magician.
Being awakened, but with extremely limited potential.
As there are critters who automatically start with a Magic attribute, but still don't have any of the Magician, Adept or Mystic Adept qualities, i can imagine that, for those critters, developing a spell knack is certainly possible, as both being a full-blown magician and not having any awakened abilities besides those they are born (or quasi-reborn) with are valid options for them.
I regard the fact that the rules for all advanced character options in RC explicitly lay out what magic or resonance-based qualities they can or cannot take and never mention that Spell Knack is not a possibility as a support of that assumption.
As far as building such a character is concerned, you could go with option 2 in the OP, houserule Spell Knack altogether (why should the quality only be un-nerfed for vampires, right?), take the approach suggested by you or choose the Magician quality and Incompetence for certain magic-linked skills.
All these options would be a possible way to model a character with limited magical abilities, even though the latter two seem to be mechanically superior to me.