Player thralls wil try to use non-lethal weapon (if they have it in their inventory) when fighting tier 4 (named) thralls (if they can be knocked out).
Pets will ignore "named" thralls completely (if they can be knocked out).

Default hotkeys summary
Shift+K force your thralls to use lethal weapon against current target.
Shift+U force your thralls to use non-lethal weapon against current target.

You can configure hotkeys, default mode and black/white lists in configuration menu - type in console DataCmd SNMenu
If you have ModControlPanel installed, mod's settings menu will be available under "Spare Named" section.

Modes & black/white lists explanation
Use non-lethal weapons by default is on Thralls will try to use non-lethal weapons for all Teir 4 targets, except those added in "Always Kill List" - useful, when you don't need  specific thralls and don't wish to capture them
Use non-lethal weapons by default is off Thralls will use their lethal weapons against Tier 4 targets, except those added in "Always Stun List" - useful if you wish to capture only specific thralls

If player is in clan, then clan's thralls will use clan leader's default mode and lists, except those thralls which follow player -  they will use player's settings. If player is on his own, then his thrall will always use his settings.

Player can always use hotkeys, to force allied thrall in range to use lethal/non-lethal weapons against their current target.

Bonus: Increase player thralls inventory to 10 slots if they have less.

No asset was changed. Should be compatible with anything.

Check my other mods:
Rhino WarMount
PackRat Helper
Backpack Fridge
Pull To Surface
Catch and Carry