Yeah, it would be good if you could play with other users, but then it might get a little too easy if there's three plus people against the game itself. It might work on some games though, but then it would mean reediting the game, which would take a lot of work for the authors of the games.
Weapon/level editor I think.I know that some games (Armor mayhem for a good example) has a level editor, but still, making levels on some games is fun!And I cant rememebr any flash game which had a weapon editor, so...
I am not huge fan of online games, since usually I lag on them, so it isnt so fun to play.