What are the ways to add skills from PoR, RD, and awakening right now, and what are the issues with implementing skills if there are any?
The best way to get skills in FE7 is to stop hacking FE7 and hack FE8 instead, since there's a really neat skill system already made for 8
Not only what MC said, but FE8 has a lot more newer work being done on it if I'm not mistaken.
Ways to add skills: assembly.Issues with implementing skills: lack of time and motivation on the part of those who could actually do it.
The other possibility is using FEBuilder and a Japanese rom for FE7. I think FEbuilder has a skills patch for FE7J.
But why would you want that when the fe8 skills patch is just better?