Here's a short mod that turns Berserkers and Touch of Madness off completely. It just sets both spells so they'll never be researched.
Code:
#modname "Touch of Sanity"
#description "Turns off Berserkers and Touch of Madness"
#selectspell "Berserkers"
#school -1
#end
#selectspell "Touch of Madness"
#school -1
#end
The mod's also
here to save y'all the fatigue cost of cutting and pasting it.
(You may need to right-click "Save as...".)