Yes, LWOTC is a thing for other people reading this.

So far, i noticed these problems and possible solutions.

1) (LW2 FEATURE) SMG's cant be used.

Solution by CPTNHotSauce

引用自 CPTNHotSauce：

Started a new run with Dev-20.1. forgot to add
+AllowedWeapons=(SlotType=eInvSlot_PrimaryWeapon, WeaponType="smg")
to the UniversalSoldier template in XcomClassdata.ini

2)(BUG) Some psi abilities cannot be trained. Domination and rift requires solace, but if you learn that skill you cant still use it
I assume this is a conflict with LW2 since Solace in base game (that RPGO) uses actually works differently in LW2
In LW2, solace is a targeted skill you can use to purify your soldiers at range compared to the AOE instant cleanse.
So the psiops addon uses vanilla Solace, but uses the LW2 other skills like domination or rift. This rather nerfs Psiops.

3)(BUG-CAN BE FIXED) You will get promotions after every single battle because RPGO uses different XP requirements than Long War so you will get overpowered troops extremely quickly

SOLUTION - Copy and paste all the content of LWOTC Soldier XP.ini to RPGO's Soldier XP.ini and replace it.
Simple and works, either find these files manually or use the Alternative Mod Launcher to do hasten up the search.

4) (BUG - CAN BE FIXED) Game will weird out if you promote your troops for the first time outside of Skyranger, giving them random perks, classes etc...

SOLUTION - Always promote your troops directly in the armoury, you can promote your troops normally after their initial promotion.

5) (BUG-FIXED VIA OTHER MODS) Sometimes you cannot chose a class, or the "Universal soldier" is missing upon promotion
There is something odd here, if you use disable any class, you might get what you want, but also not and i have no idea what is happening. Sometimes the universal soldier is the only class to get, but after a mission you got other classes to chose from or you will be forced upon you.

So whenever that works or not is dependable on some hidden (to me) factors but i found a workaround through another mod i've been using for LW2 and that is Chose my class. By going to the ini's you can change the number of classes so i rewritten that to 22, so no matter what i can always find the Universal soldier in the list. This is the solution i've used, maybe there are other alternatives on the workshop but that is my solution without downloading additional mods.

6)(LW2 FEATURE) Your troops cannot be officers
The officer system doesnt recognize Universal Soldier as a class so no officers.
Well, i guess that will make RPGO troops less overpowered but...

Solution -

引用自 SabaraOne：

Go into RPGO's Config folder and open the file in the RPGO_PromotionScreen subfolder. Add this at the bottom

.IgnoreClassNames=UIArmory_LWOfficerPromotion .IgnoreClassNames=UIArmory_LWOfficerPromotionItem

That should tell RPGO not ot mess with the Officer promotion screen

7)(BUG-CAN BE FIXED WITH OTHER MODS) Primary secondaries creates weird duplicates that can only be used in primary slot. In engineering you can see two, identical items and you cannot tell which one is for what. So i wasted a precious Lancer corpse on a sword that can be only used in primary weapon slot. And i really want to have a strong main weapon in a mod like LWOTC and a sword as a finishing touch.

Solution - CPTNHotsauce used TRUE primary Secondaries mod and that fixes it

8)(LW2 FEATURE) Any damage/performance based perks tied to weapon tech tier dont recognize Laser and Coil weapon tier.

9)(LW2 FEATURE - CAN BE PARTIALLY FIXED VIA CONSOLE COMMANDS) Any class mod that adds armour wont work either because plated and powered research wont provide them to you. RPGO supersoldiers for example. You will be stuck with baseline armours, while this doesnt make them unplayable you need to compensate elsewhere to keep up your durability.

Motec found a solution and i can confirm it does work, but alas it gives you unlimited number of them so its only a band aid.

引用自 motec_ed：

I also might have a temporary fix for the rpgo super soldier armours.
In the XCOMLW_Overhaul config file, theres a section about a third of the way down that controls what items are automatically in your inventory when you start a game. Again, need the ingame ID but point stands...

; add items here so they get added to storage when loading an existing campaign save
+UnlimitedItemsAdded="Arcthrower_CV"
+UnlimitedItemsAdded="SawedOffShotgun_CV"
+UnlimitedItemsAdded="Holotargeter_CV"
+UnlimitedItemsAdded="CombatKnife_CV"
+UnlimitedItemsAdded="LWGauntlet_CV"
+UnlimitedItemsAdded="FlashbangGrenade"
+UnlimitedItemsAdded="SmokeGrenade"
+UnlimitedItemsAdded="SMG_CV"
+UnlimitedItemsAdded="Pistol_CV"
+UnlimitedItemsAdded="Medikit"
+UnlimitedItemsAdded="ShredderGun"
+UnlimitedItemsAdded="CeramicPlating"
+UnlimitedItemsAdded="CasterGauntlet_CV"
+UnlimitedItemsAdded="ThrowingKnife_CV_Secondary"
+UnlimitedItemsAdded="MjolnirPoweredArmor"
+UnlimitedItemsAdded="N7PoweredArmor"

10) (BALANCE) Ability point gain
LWOTC castrated the way you can get ability points, so you might want to edit it back so you can afford more skills.
Open the LWOTC workshop file OR open it with AML (more convinient)

Config/XCOMGamecore.ini

Line 2454

; Disable basic ability point events
[XComGame.X2EventListener_AbilityPoints]
MaxTacticalEventAbilityPointsPerBattle=0

Change the zero to any number you want, like 20. (So its possible to get 20 ability points per mission)

You might want to also upgrade the reward for killing a chosen

Line 2195
[ChosenKilled X2AbilityPointTemplate]
NumPointsAwarded=5
TacticalEvent=false
Chance=100

11) (BALANCE ) Ability cost multiplier

Depending on how your mods override each other or any other mods that could touch this. You might need to change this so the price for abilities doesnt skyrocket in to insane, unfeasable numbers
Again, open either the workshop files or open it with AML for convinience of editing.

Config/XComLW_Overhaul.ini
Line 2023
; Cost multiplier for the first purchased class ability
BASE_ABILITY_COST_MODIFIER=0.2

Change it to like 0.001.... not sure what happens with 0, nothing probably.

12) (Balance) How much atribute points you get

To change stuff about that, open AML/the RPGO folder itself, go to :
Config/StatUpgradeUI/XcomStatUpgradeUI

And go down

first thing to look for is line 34
DefaultStatPointsPerPromotion=

Then line 53 and onward, which distributes more points depending on natural aptitutude

BaseSoldierNaturalAptitude[0]=
BaseSoldierNaturalAptitude[1]=
BaseSoldierNaturalAptitude[2]=
BaseSoldierNaturalAptitude[3]=
BaseSoldierNaturalAptitude[4]=

At the start of the file you could also simply change how much atributes cost to build up, something like aim should cost more to level up since its so essential for most classes. You could also play around with it to make price rack up more quickly so it has diminishing returns much earlier.