Scenario editor tips

I’m trying to get villagers to be able to garrison into things that they normally can’t garrison in. How do I do that? I’ve checked the effects and can’t find the correct one. I’m also trying to modify villager health but it’s not working after getting loom?

Another thing I don’t know how to do is to modify stats, like range and speed and how to make temporary debuffs/buffs.

Other tips are appreciated!