As most of us probably know, there are some nomadic factions in middle earth. Right now those factions have camps. That is a way to add them, but I thought there could be a slightly more realistic way to add them. (Dislamer: I don't know much about coding, if anything in this suggestion is impossible to code, I'm sorry)
The Base of the Idea:
I thought that nomadic factions should appear in the way that traders do. But they should spawn with probably a unit captain, a couple of traders, Abit of cavalry and mounted citizens, more soldiers and citizens and cattle. They should probably stay for a longer while and when they are leaving a message should be displayed in the same way as with travelling merchants. But instead of it being said by a merchant, the name of the unit captain should appear.
I think that there shouldn't be a huge amount of nomadic factions. But I made a list of the factions that I think should be nomadic, the biomes they spawn in and their cattle:
Gundabad orcs, their cattle should be nothing but wargs. They should spawn nomadically in the Misty Mountains, The Lone Lands, Eriador, The Coldfells, The Trollshaws, The Ettenmoors, Vales of Anduin, Eregion and Midgewater.
Variags, these are already planned, but I think they should be added in this way. Their cattle should consist of Camels, Aurochs and rarely kines of Araw (these should have like a 1%-5% chance of spawning with the nomads). They Should spawn in Khand.
Elf Wanderers, these should either be a mix of Galadhrim and High Elves (And in the future Rivendell Elves), or a seperate faction. They should be really rare and have no cattle, but still have mounted npcs like the other factions. They should spawn in Lindon, Lothlorien, Vales of Anduin, the Misty Mountains, the Lone Lands, the Shire and Eriador
Dúnedain, These should have no cattle, no mounts and no citizens, They should spawn in all biomes rangers spawn in right now except for the Angle.
Near Haradrim, These should either be Normal near Haradrim appearing nomadically or a new faction. Their cattle should be camels and Aurochs. They should spawn only in the Near Harad Desert.
Far Haradrim nomads: These are highly discussable. I think they should either be a new faction or moredain. Their cattle should be Gazelles and Zebras, if they even have cattle. They should spawn in the Savannah.
Feedback is highly appreciated and this topic is open for discussion.