Let's clarify something
This should have read:
Enemy Density and Respawn Sandbox Options do not increase desert or snow rare spawns like Chuck and Rancher
In spawning.xml,
<biome name="desert">
<spawn id="dz01" maxcount="1" respawndelay="0.9,1.575,1.215,0.9,0.9,0.9" time="Day"...