Since I'm dropping my elixirs mod, I moved the molotov cocktail and naptha into fun_tools. (Appropriate, since naptha is a requirement for the internal combustion engine the power tools depend on.) These are based on NPX's wonderful Not So Simple Bombs API.
[edit Nov 12]
I've also added two pistols -- a flintlock, and a wooden pistol that fires pebbles (and can be made with beginner materials). They take the place of early swords, and are much more convenient. Both will automatically reload as long as you have gunpowder and bullets in your inventory.
The source is available on github.
Textures: CC0 and CC3
Mod dependencies: default, elixirs?, tnt?