I check the forum every day, and I have a debug room that I use to figure out what all the opcodes do, so if there's an opcode missing that you might use, feel free to PM me about it and I'll try to document it ASAP. I know what most of the missing functions do, I just haven't gotten to documenting them. There are only a small handful of opcodes I'm clueless about.
I was going to release my debug room about a month ago, but it's not done because I haven't found the Diablos, Tonberry King, or Jumbo Cactaur battles yet (they're not called from field scripts, so I can't find them with Deling). I've been going through every encounter one by one and I'm only in the 300s (there are over 1000 battle encounters in the game).