I could possibly edit the frag grenade?
Ive made it so it has a one hit kill explosion, so if it explodes beside someone, they die, and each piece of shrapnel does double what it used to. Is that what you want?
EDIT: Its done. It has 2x as many pieces of shrapnel, 2x shrapnel damage, and 2x radius damge.
Ill post it in Add-ons.