Discombobulator Grenades
Often times rdmer's will quickly reach the minimum 10 karma, and from there they throw discombobulator grenades at everyone. Those grenades should be available from the traitor shop only. How often is an innocent going to find a traitor alone, and kill him with a discombobulator grenade? Not often!
Smoke grenades
...barely ever useful, ever.
Incendiary Grenades
Good!
I think the default grenades need to be adjusted, and also some new grenades with cooler features wouldn't hurt!