I went ahead and looked at this in game, and I am happy to report that I was wrong. Any Faerie Fire should allow you to get the 3% crit, even if you didn't cast it.This is exactly what we wanted. A final and definitive statement about Improved Faerie Fire. The bonus here is that by the tone of GC's post there isn't any plan to change it. This is a true win for moonkin.
So the tooltip should probably read:
Your Faerie Fire and Feral Faerie Fire spells also increase the chance the target will be hit by spell attacks by 3%, and increase the critical strike chance of your damage spells by 3% on targets afflicted by [anyone's] Faerie Fire or Feral Faerie Fire.
I don't always have the game right in front of me when I am reading forums (most often I am on a painfully topical beach sipping mai tais) so I try not to guess unless I am pretty sure about something. I was pretty sure about this, but I was wrong. It happens. There are like 15,000 spells in the game.
Now that this is confirmed, Improved Faerie Fire is a core talent of any moonkin raiding build. There is really no other way to get around it. If you have a feral druid in your raid it is a static 3% increase to crit. If you don't have a feral druid in raid someone has to apply the minor armor debuff and Faerie Fire is the best option.
Thank you Ghostcrawler for taking the time to look into this and clearing it up. Any rational player doesn't expect you know everything about the game off the top of your head, and you can't possibly research every question presented on these forums. So, a misunderstandings like this is bound to happen once in a while. As long as it is cleared up I'm fine.
Thanks to Foofy for being a pit bull on this topic. If you hadn't pushed it so hard I'm sure we would still be having this debate for months.