Manage items and quality of them in the generated map

[Cubenape]

Hi
We are creating a Battle Royal mod on Rimworld, based on some other mods, such as multiplayer, Rimcities, Cherry Picker ect.
We are using Rimcities as a battleground with the Ghost city and the random generation of items (We clean some useless items for the battle royal with Cherry Picker). 4 people come on the map, they explore the city to find weapons and gears, and try to kill the others.

The question is : Is it possible to change the amount and the quality of the items generated in the ghost city? For example to find a poor heavy SMG and a legendary armor in more places on the map.

Thanks