just going to post my main suggestion here again.
I was a little disappointed by how little time the Great Khans get. I was thinking there could be a bit of expansion there.
For example, Some of the Khans have been harassed by the Vipers and Jackals. Your sent out to investigate, and find out that the two of them are working together to take over the Great Khans chem trade. You can either assassinate their leaders, getting rid of the potential threat, where they return to being minor players, or you can negotiate between them and the Khans to form a raider coalition. Once they settle into Red Rock, their respective leaders would become advisers for Papa Khan making Oh My Papa slightly more difficult. The two other raider groups would bring other quests into the mix, such as helping the Jackals raise molerats for food and fending off a Yao Guai pack, while the Vipers could make you teach them poisons and finding supply creches. rewards could be new perks or weapon mods (modded melee weapons perhaps). Who knows, bringing the three bands together could increase the Khan reinforcements at the Dam. Jackals riding Yao Guai and Vipers in Stealthsuits might make for some interesting battles.
here's the schematic for the Spear Crossbow along with three upgrades. each upgrade would also increase the weight of the weapon, transitioning from a light, manual-load, single shot weapon to a heavy, auto-load, semi-auto weapon.
Paint Gun- trigger
Crutch- stock
Rake x4- main body
Whet stone- slide for spears
Lawnmower blade x2- bow section
Leather belt x3- bow string
Surgical Tubing x4- reloading wire
Firehose Nozzle x2- hand cranks
Triangle- brace near stock
Duct Tape- binding various parts
Viper Upgrade (stealth/durability upgrade)
Stealth Boy- stock addition (silences weapon)
Motorcycle handbreak- front grip (increases accuracy)
Nail board x2- main body addition (increases condition)
Duct Tape- binding various parts
Jackal Upgrade (power upgrade)
Sensor Module- sight addition (increased range)
Fission Battery- grip addition (increased damage)
Scrap Electronics x2- connective parts
Duct Tape- binding various parts
Great Khan Upgrade (semi-auto upgrade)
Steam Gauge Assembly- underbelly ammo cartridge (increased ammo capacity)
Conductor- hand crank addition (increased firing speed)
Scrap Metal x2- connective parts
Duct Tape- binding various parts
without the Viper upgrade, the other two upgrades would make the weapon significantly louder, due to the electronics and moving parts involved. ammo could include explosive, gas-tipped (poisonous hallucinogenic cloud) or Ripper-Tipped.