Alrighty I have a couple questions and a few opinions.
•what about nemesis do you want changed?
•what are you wanting to see/do in a more expansive raccoon city setting?
•what weapons would you add?
There are 2 pistols, 2 shotguns, an m4, a magnum, a mine thrower, a Gatling gun, a rocket launcher, and the ability for infinite ammo.
•what other characters would you add?
Claire and Leon are already there hence re2. Chris is Mia, depending on how you play the game barry saves you, and you get to play as Carlos even if it's a short period of time. I suppose you could add Rebecca but honestly jill gets way too much hate it seems and the game just wouldn't be the same of it weren't her story. Other than re1 it's really her only other playable role until you play mercenaries on 5 or revelations.
I do agree it would be awesome for the new graphics and a larger area with more run ins with nemesis. I wouldn't mind playing as Carlos longer, and maybe instead of new guns you could possibly obtain or buy (through mercenaries) upgrades for your weapons. Just my two cents.