I was disappointed by how incomplete the vanilla KO/Fatigue system seemed to be so I decided to make this. It is still an early release, so this plug-in will update frequently.

Features (so far):

• Adds Tranquilizer Darts for use with the Varmint Rifle and the .22 Silenced Pistol. These will drain the Fatigue of any opponent (excluding robots) and cause them to become unconscious within seconds. For now these (and other mod items) are purchasable at Chet's General Store.
• Adds Stimulant Darts which wake up the unconscious and heal over time.
• Adds Fear and Frenzy Darts which will cause victims to either flee for their lives or mercilessly attack, ignoring all factions. Ideally they will return to their normal behavior after one minute. Caution: These are far from perfected, and may result in a permanent effect, especially if the victim changes cells during the effect.
• Improves the Boxing Gloves, Golden Gloves and Boxing Tape The script has been redesigned to that the fatigue damage scales with unarmed skill in the same manner that normal damage would. It also checks for perks, chems, and critical strikes and applies the appropriate bonuses.
• Improves the Police Baton, Cattle Prod and Rolling Pin so that they function similarly to the gloves above.
• Improved Bean Bag rounds now for both 12 gauge and 20 gauge shotguns.
• Adds Stunning Energy Cells for use with energy pistols.
• Pacifies unconscious enemies Opponents will exit combat when knocked out by the weapons, and they will stay out of combat until they regain consciousness.
• Extended KO time In the vanilla game opponents stay KOd for only 30 seconds, with this mod opponents will stay cold for a full five minutes.
• Loot the unconscious This mod enables looting of unconscious opponents.
• KO Experience system For knocking out opponents you will receive half the XP you would receive for killing them. After receiving XP once, you will not be rewarded for knocking out the same opponent for 24 game hours.
• "No Kill" Perks +2 Charisma for 0 people killed. +2 Luck for 0 creatures killed. Automatically added at any point after leaving Doc's house. Player is alerted when either perk is lost. You can kill as many robots as you damn well please.
  

Future/Planned Features:

Hollow Blade - A painless melee chemical applier.
Aerosol Sprayer - A loud, but non hostile close range chemical applier

Non-Lethal Grenades:
Flash Bang - Cripples heads of affected opponents and temporarily (but severely) damages ranged weapon proficiency.
Smoke Bomb - Creates a temporary smoke circle that renders everyone inside effectively invisible.
Fear Grenade - Afflicts victims with Fear poison.
Frenzy Grenade - Afflicts victims with Frenzy poison.
Sting Grenade - Non-lethal ammo for the grenade launcher.

Shock Mine - Instant KO proximity mine.

Throwable Baseball - Behaves like the other melee weapons, but throwable.

Alien Blaster and ammo:
Shrink - Shrinks targets and causes a variety of debuffs.
Grow - Enlarges targets and grants several buffs
Freeze - Paralyzes opponents.

Balance fatigue points on many creatures. (For example most humans have 200-300 fatigue, but Deathclaws have 50)

A Fatigue Meter displayed for Targets.

Particle effects to indicate enemy status. (e.g. stars or Zs over a KOd opponent, or a light red mist for frenzy)

Any feedback and bug reports would be very appreciated, especially if it causes any game breaking behavior.
This mod uses Variable08 to check if opponents have been KOd recently, please let me know if there are any known conflicts.