I was thinking about a better flash nade, but replace it with a flash bang.
A flash bang is a specail grenade that blinds, deathens, and sends a big shockwave, if a player is to near, he will die or get seroisly ingured. Thus stunning and hurting the victum while turning off his volume for 10 seconds and making a ringing sound in his ears, and blinds for 10 seconds. But the old flash grenade went through walls, so perhaps make it so it can not go through walls.
Left 4 dead 2 is amazing, so perhaps some updates could be...
-Demo gun only when downed.
-Hunter pins player and sits on top.
-Spitter with goo that lasts for 5 seconds and does -1 DMG.
-Jokey, just add a laughing sound, same model as tank with creppy face.
-Charger, runs into players and pounds.
-Zombies are aloud to climb walls.
Thanks, please let me know if you want to make these.