This takes effect as soon as you restart the game:
http://www.matrixgames.com/forums/tm.asp?m=1976562

<t> Hello,<br/>
<br/>
If like me you find the enemies use of grenades a bit too excessive you can stop them from using them by making a change the to the enemys AI LUA script, very simple:<br/>
<br/>
Open the file b_soldier.lua<br/>
<br/>
found in Tri Synergy\Hired Guns\basis\scripts\ai<br ...