Well, I can say that the custom perk are somewhat playable with et_tu. I have downloaded the new perks pack and the older one(2019 version). The new one is not compatible at all and the old one is kind of is. If I extract only the perk related scripts and the customperks.ini the perks are workink. But is I extract the rest of the scripts thaat has a name "HS_" it cause everyone in the game to do 0 damage with any weapon to anyone no matter the armor or the weapon. Rockets to the face do no damage to tribals lol.