Is your feature request related to a problem? Please describe.
Me and my friends like the mca villagers, but also miss certain mechanics that are reliant on the vanilla testificate villagers, I tried to disable zombie villagers being overwritten so that there could be a lore implication (the normal villagers arent able to defend themselves, and thus eventually got wiped out by the zombie virus, but can still spawn as zombie villagers)

Describe the solution you'd like
A config option that lets you tweak the spawn rates, like 50% mca zombie villagers to 50% vanilla zombie villagers, and vanilla zombie villagers won't turn into glitched mca villagers when you heal them. Maybe a similar spawn tweak for mca villagers and villages versus normal vanilla villagers and villages

Describe alternatives you've considered
I already tried to disable mca zombie villagers overwriting vanilla zombie villagers, but when I healed them, the vanilla zombie villager turned into a glitched mca villager with a glitched texture and bugged dialogue. I would try to write it myself but I'm only a modpack maker, not a mod developer haha

Additional context
The ability to do iron farms and villager farms for trading is being missed, id like a natural way to get normal zombie villagers and villagers without having to spawn them in manually, Thank you so much!

I added fractionOfVanillaZombies, which is what you need I think. For villagers, use fractionOfVanillaVillages as replacing entire villages is more immersive than a mix.