A simple patch mod that uses a bit of code taken from [url=https://steamcommunity.com/sharedfiles/filedetails/?id=2021510577]More Slaves[/url] to add more slaves to faction settlements.
Note that it only adds slaves to settlements and orbital traders, not slave trade caravans.
I might update this to add more slaves to trade caravans if I can figure out how patching works without getting a migrane.
Syrchalis is the original author and the code belongs to them, I have simply taken a piece of it for this simple patch mod.