Note: This procedure requires editing a game file; creating a backup copy of the file before proceeding is recommended. With a text editor, edit the "default.ini" file in the "system" folder in the game directory. Find the "[Difficulty]" heading, then change the following values of the indicated lines for the corresponding difficulty setting. Using "0" as a value usually disables that attribute. Start a new game to play with the added effects. This cannot be used with an existing saved game.
"AI visual acuity multiplier" for how well the AI can see. "AI auditory acuity multiplier" for how well the AI can hear. "AI tactile acuity multiplier" for how well the AI can feel. "AI hitpoints multiplier" for the AI starting hit points. "AI-to-player damage multiplier" for how much damage the AI takes.