I would not want it myself, both because of the general logic that if you want a Northern Dúnedain, you go to where the Northern Dúnedain lives, and rarity creating the special worth of a unit beyond it's stats.
Still, it can be argued men should be possible to muster across the realm to where they are needed, especially if at a lower speed, to not upset the game balance to much. And in cases with units as the Dragonslayers, the Dwarves do not live in the Grey Mountains at game start anyhow, so it's a grey scale case (pun not intended). Anyhow, it won't affect my game how someone else plays or edit his own game, so do not really care.
To enable an AoR unit anywhere, edit its entries in export_descr_buildings.txt, found in Third_Age_3/data
There are several approaches. Here're two easier ones:
1) Either make it a unit avilable elsewhere than in it's core provinces, but at a slower rate. Dragonslayers as example. Copy the unit entry (looking like this)
Code:
recruit_pool "Dragonslayers" 1 0.15 2 0 requires factions { moors, } and hidden_resource grey_mountains
and add an additional line under each of the units entries (there are 6 of them, for different levels of barracks in cities and castles, so don't stop after the first, and they often differ from entry to entry, so keep an eye on that). Now it should look like this. Do not forget to decrease the replenishment number and add a not before hidden resource:
Code:
recruit_pool "Dragonslayers" 1 0.15 2 0 requires factions { moors, } and hidden_resource grey_mountains
recruit_pool "Dragonslayers" 1 0.05 2 0 requires factions { moors, } and not hidden_resource grey_mountains
In this example, the Dragonslayers are avilable every 7th turn (1/0.15 = 6.6) in the Grey Mountains, that have the hidden resource grey_mountains.
While in all other regions, that have not the hidden resource grey_mountains, the unit is avilable every 20th turn (1/0.05 = 20).
You can play with the numbers as you please, naturally.
2) Alternativly, making the Dragonslayers as common as any other unit, I would recommend this approach.
The unit is avilable earlier than other units of equal strength, because it's an AoR. This would become unbalanced if it's made a common unit, ofc. So delete the first "Dragonslayer" entry in city barracks completly (it's teh first Dragonslayer if you start searching form the top) and move on to next building level.
Find a unit of equal worth. In this example, the Iron Guard do fine. Looking like this:
Code:
recruit_pool "Dragonslayers" 1 0.15 2 0 requires factions { moors, } and hidden_resource grey_mountains and region_religion islam 50
recruit_pool "Iron Guard" 1 0.12 2 0 requires factions { moors, } and region_religion islam 75 and hidden_resource mountains
recruit_pool "Iron Guard" 1 0.08 1 0 requires factions { moors, } and region_religion islam 75 and hidden_resource forest or hidden_resource grasland
recruit_pool "Iron Guard" 1 0.06 1 0 requires factions { moors, } and region_religion islam 75 and hidden_resource desert
Copy paste the Iron Guard entries, change the unit in question and then delete the Dragonslayers original entry:
Code:
recruit_pool "Dragonslayers" 1 0.15 2 0 requires factions { moors, } and hidden_resource grey_mountains and region_religion islam 50
recruit_pool "Iron Guard" 1 0.12 2 0 requires factions { moors, } and region_religion islam 75 and hidden_resource mountains
recruit_pool "Iron Guard" 1 0.08 1 0 requires factions { moors, } and region_religion islam 75 and hidden_resource forest or hidden_resource grasland
recruit_pool "Iron Guard" 1 0.06 1 0 requires factions { moors, } and region_religion islam 75 and hidden_resource desert
recruit_pool "Dragonslayers" 1 0.12 2 0 requires factions { moors, } and region_religion islam 75 and hidden_resource mountains
recruit_pool "Dragonslayers" 1 0.08 1 0 requires factions { moors, } and region_religion islam 75 and hidden_resource forest or hidden_resource grasland
recruit_pool "Dragonslayers" 1 0.06 1 0 requires factions { moors, } and region_religion islam 75 and hidden_resource desert
Has to be done multiple times too, naturally (and keep in mind after the city barracks comes the castle barracks, where it 'starts over'). But then the Dragonslayer is as any common unit in the roster.
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Notes: if you play with a submod and not vanilla TATW, get Notepad++ which is a freeware. Just using Notepad can risk crashes.
Also, ALWAYS back up the file before making edits, as it's easy to slip