About number 5.
I think it will be better say try to find soundtracks that isn't common around in fanmade games.
I agree with GlitchxCity through since it's overrated and many use it enough.
Also trying and find the music genre(s) that fits for each route and city.
I can't truly explain what i mean since my english is kind of broken through..
I can try and giving examples, but i think people wouldn't understand what i mean..
Example is that Gen three or Hoenn region music was known for trumpets.
i really don't know how to say it, but maybe understand what i mean..