...

The unaffiliated cave systems are the only areas currently heavily populated with the template+population system.

Extending Encounter Tables

You may add new entries to encountertables by including encountertables.xml in your mod, using an existing table name and setting the Load="Merge" property on the encountertable tag.

<encountertables>
  <encountertable Name="Ammo 1" Load="Merge">
    <objects>
      <object Chance="100" Number="3d6" Blueprint="My New Ammo"></object>
    </objects>
  </encountertable>
</encountertables>

Additional Info

Here's a thread on Steam where I discuss using encounter and population tables: http://steamcommunity.com/app/333640/discussions/3/358415738194955181/