Yay.
Now it will fit in perfectly with Starfire's hopefully.
*cries*
I really wanna know this ;o
Creating another MCA.esm and merging leveled lists would not give you the result you want.
Spawn points work by randomly picking only one creature/npc from its assigned leveled list(s). So even if you added more of them to the leveled list it would still only spawn one of them.
You would need to place a spawnpoint into the map using the construction set. I haven't done this myself yet, but I think the steps are pretty easy:
Spoiler
Open MCA.esm in the construction set, but do not activate it.
Click Leveled Creature, scroll through, and select the creature/npc list you want to use.
On the right hand side, find and double click the place you want to add the spawnpoint to in the Cell View window.
When the area is loaded up in the Map window, drag the leveled list you selected into the map where you want them to appear at/near.
Save and name your mod something so you will remember what it is like "MCA -More NPCs addon"
I hope that helps.
Please someone correct me if I got it wrong. But each spawn point has to be hand placed unless someone has made a utility that randomly places them in a cell.