I have a world that’s always in night-mode, how can I make it so that friendly mobs still spawn at the same rate?
I'm not 100% sure but I believe you can actually change the spawning conditions of mobs in a file. With bukkit I saw it was in the bukkit.yml file. If you can look through and find a similar area in a similar file of spigot that might be the only way. You could also contact a developer to see if someone can make it for you!