So, now having read through the entire thread in three hours, I have only this to say - amazing. I'm so amazed at how much you've done and how committed you've been. I can't think of any hack of any game with that amount of dedication (not including Elibean Nights).
And on finishing, there aren't a couple th things i to to ask/say.
1. A huge thing that bothered me with FE6, for some reason, was that the Sage/Druid/etc. critical animations didn't have the sound at the beginning like 7 and 8 have. Was this fixed?
2. I think it might be useful to specify within skills if current or max HP is the one being talked about. There wasn't one skill above that confused me a bit because of that.
Really though, amazing job.