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test these out for yourselves, let me know what you think

<configs>

<append xpath="/rwgmixer/township[@name='town']/property[@name='biomes']/@value">,forest</append>
<append xpath="/rwgmixer/township[@name='citybig']/property[@name='biomes']/@value">,desert,burntforest</append>

<append xpath="/rwgmixer/prefab_spawn_adjust[@partial_name='trader_jen']/@biomeTags">,desert,snow</append>
<append xpath="/rwgmixer/prefab_spawn_adjust[@partial_name='trader_bob']/@biomeTags">,burntforest,snow</append>
<append xpath="/rwgmixer/prefab_spawn_adjust[@partial_name='trader_hugh']/@biomeTags">,desert,wasteland</append>
<append xpath="/rwgmixer/prefab_spawn_adjust[@partial_name='trader_joel']/@biomeTags">,desert,snow</append>

</configs>

this in practice so far allows for some trader dithering through the biomes while keeping progression mostly in tact. should allow for the center biome to be almost any.
and
 

<configs>
    <remove xpath="//biome[@name='pine_forest']"/>
    <remove xpath="//biome[@name='burnt_forest']"/>
    <remove xpath="//biome[@name='desert']"/>
    <remove xpath="//biome[@name='snow']"/>
    <remove xpath="//biome[@name='wasteland']"/>

    <append xpath="/spawning">
	<biome name="pine_forest">
		<spawn maxcount="3" respawndelay="2.9" time="Day" entitygroup="ZombiesAll" notags="commercial,industrial,downtown" />
		<spawn maxcount="5" respawndelay="3.3" time="Night" entitygroup="ZombiesNight" notags="commercial,industrial,downtown" />

		<spawn maxcount="2" respawndelay="0.3" time="Day" entitygroup="ZombiesAll" tags="commercial,industrial" notags="downtown" />
		<spawn maxcount="3" respawndelay="0.15" time="Night" entitygroup="ZombiesNight" tags="commercial,industrial" notags="downtown" />

		<spawn maxcount="3" respawndelay="0.3" time="Day" entitygroup="ZombiesForestDowntown" tags="downtown" />
		<spawn maxcount="3" respawndelay="0.1" time="Night" entitygroup="ZombiesForestDowntownNight" tags="downtown" />

		<spawn maxcount="3" respawndelay="1" time="Any" entitygroup="WildGameForest" spawnDeadChance="0" />
		<spawn maxcount="4" respawndelay="1" time="Night" entitygroup="WildGameForestNight" spawnDeadChance="0" />
		<spawn maxcount="2" respawndelay="3.2" time="Night" entitygroup="EnemyAnimalsForest" spawnDeadChance="0" />
	</biome>

	<!-- *** BURNT_FOREST_SPAWNS -->
	<biome name="burnt_forest">
		<spawn maxcount="3" respawndelay="2.8" time="Day" entitygroup="ZombiesBurntForest" />
		<spawn maxcount="5" respawndelay="3.2" time="Night" entitygroup="ZombiesNight" />

		<spawn maxcount="3" respawndelay="0.25" time="Day" entitygroup="ZombiesAll" tags="commercial,industrial" notags="downtown" />
		<spawn maxcount="4" respawndelay="0.15" time="Night" entitygroup="ZombiesNight" tags="commercial,industrial" notags="downtown" />

		<spawn maxcount="3" respawndelay="0.15" time="Day" entitygroup="ZombiesDowntown" tags="downtown" />
		<spawn maxcount="4" respawndelay="0.1" time="Night" entitygroup="ZombiesDowntown" tags="downtown" />

		<spawn maxcount="2" respawndelay="1" time="Any" entitygroup="WildGameForest" spawnDeadChance="0" />
		<spawn maxcount="1" respawndelay="1.1" time="Any" entitygroup="EnemyAnimalsBurntForestAny" spawnDeadChance="0" />
		<spawn maxcount="3" respawndelay="1" time="Night" entitygroup="WildGameForestNight" spawnDeadChance="0" />
		<spawn maxcount="1" respawndelay="1.1" time="Night" entitygroup="EnemyAnimalsBurntForestNight" spawnDeadChance="0" />
	</biome>

	<!-- *** DESERT_SPAWNS -->
	<biome name="desert">
		<spawn maxcount="3" respawndelay="2.7" time="Any" entitygroup="ZombiesAll" notags="commercial,industrial,downtown" />
		<spawn maxcount="5" respawndelay="2.1" time="Night" entitygroup="ZombiesNight" notags="commercial,industrial,downtown" />
		
		<spawn maxcount="3" respawndelay="0.2" time="Day" entitygroup="ZombiesAll" tags="commercial,industrial" notags="downtown" />
		<spawn maxcount="3" respawndelay="0.1" time="Night" entitygroup="ZombiesNight" tags="commercial,industrial" notags="downtown" />

		<spawn maxcount="3" respawndelay="0.2" time="Day" entitygroup="ZombiesDowntown" tags="downtown" />
		<spawn maxcount="4" respawndelay="0.09" time="Night" entitygroup="ZombiesDowntown" tags="downtown" />
		
		<spawn maxcount="2" respawndelay="1" time="Any" entitygroup="WildGameForest" spawnDeadChance="0" />
		<spawn maxcount="2" respawndelay="3.5" time="Any" entitygroup="EnemyAnimalsDesert" spawnDeadChance="0" />
		<spawn maxcount="4" respawndelay="3.5" time="Night" entitygroup="EnemyAnimalsDesertNight" spawnDeadChance="0" />
	</biome>

	<!-- *** SNOW_SPAWNS -->
	<biome name="snow">
		<spawn maxcount="2" respawndelay="2.6" time="Any" entitygroup="SnowZombies" notags="downtown" />
		<spawn maxcount="4" respawndelay="1.7" time="Night" entitygroup="ZombiesNight" notags="commercial,industrial,downtown" />

		<spawn maxcount="4" respawndelay="0.09" time="Day" entitygroup="ZombiesAll" tags="commercial,industrial" notags="downtown" />
		<spawn maxcount="4" respawndelay="0.06" time="Night" entitygroup="ZombiesNight" tags="commercial,industrial" notags="downtown" />

		<spawn maxcount="4" respawndelay="0.07" time="Day" entitygroup="ZombiesDowntown" tags="downtown" />
		<spawn maxcount="4" respawndelay="0.04" time="Night" entitygroup="ZombiesDowntown" tags="downtown" />

		<spawn maxcount="2" respawndelay="1" time="Any" entitygroup="WildGameForest" spawnDeadChance="0" />
		<spawn maxcount="2" respawndelay="1" time="Night" entitygroup="WildGameStagNight" spawnDeadChance="0" />
		<spawn maxcount="2" respawndelay="3.1" time="Any" entitygroup="EnemyAnimalsSnow" spawnDeadChance="0" />
		<spawn maxcount="3" respawndelay="3.1" time="Night" entitygroup="EnemyAnimalsSnowNight" spawnDeadChance="0" />
	</biome>

	<!-- *** WASTELAND_SPAWNS -->
	<biome name="wasteland">
		<spawn maxcount="3" respawndelay="0.3" time="Day" entitygroup="ZombiesWasteland" notags="commercial,industrial,downtown" />
		<spawn maxcount="4" respawndelay="0.001" time="Night" entitygroup="ZombiesWastelandNight" notags="commercial,industrial,downtown" />

		<spawn maxcount="4" respawndelay="0.033" time="Day" entitygroup="ZombiesWasteland" tags="commercial,industrial" notags="downtown" />
		<spawn maxcount="4" respawndelay="0.002" time="Night" entitygroup="ZombiesWastelandNight" tags="commercial,industrial" notags="downtown" />

		<spawn maxcount="4" respawndelay="0.0167" time="Day" entitygroup="ZombiesWastelandDowntown" tags="downtown" />
		<spawn maxcount="4" respawndelay="0.002" time="Night" entitygroup="ZombiesWastelandDowntown" tags="downtown" />

		<spawn maxcount="2" respawndelay="0.3" time="Any" entitygroup="EnemyAnimalsWasteland" spawnDeadChance="0" />
		<spawn maxcount="2" respawndelay="1" time="Night" entitygroup="WildGameStagNight" spawnDeadChance="0" />
		<spawn maxcount="3" respawndelay="1" time="Night" entitygroup="EnemyAnimalsWastelandNight" spawnDeadChance="0" />
	</biome>
    </append>
</configs>

in sp I have tested this and the wilderness doesnt feel as empty without causing lag issues, should work for more players without swamping servers.