IMPORTANT: It is HIGHLY RECOMMENDED to read through the two INI files from this. Allows NPCs to use weapon modifications and enables Fallout 3-style repair in which weapons can only be repaired up to a condition % equal to your repair skill lStewieAl's Tweaks Overhauls INI Installation instructions:
JIP LN Overhauls INI Installation instructions: It is especially important to read the descriptions of these mods (you should still read the description of every mod), so you know what has changed and how to use the new features. These mods are not recommended for a first playthrough of the game.
This page contains mods that greatly overhaul the game by making it much more challenging (and more rewarding in turn) and adding new features.