Maybe try a mix of Ideas 1 and 2, like: a thread for projectile moves/anti air/dash attacks (does Tatsumaki Senpyukyaku fall under this category?), and have threads for attacks like........ Akuma's Teleport or the Shun Goku Satsu, or Ryu's Evil Transformation from MvC one or something or the D-Attack feature from NGBC (that is if someone ever made it, just an example here). Make it a mix between general threads and specific threads, IMHO.
Actually all the ideas you have so far sound awesome! I'm really excited to see how you plan to go about all of this. Going to actually keep an eye on this thread, hopefully I can contribute to something in my field!
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