Is this idea still in disscussion? Just wanted to write down some of my opinions.
Lets start from afar - why people stoped playing aop after first several months? There was nothing to do except neverending PVP. There were some dungeons, but they were not so profitable. A lot of people in fonline like just to farm stuff till the end of the days and go pvp once per week. And I see here perfect possibility to bring more farm to game, without breaking the balance.
So what's mythe idea: People can craft 2 types of same weapon/armor - normal, same as we have now, and empty, one that has 5 empty perk slots. Slots can be filled with modules, with some restrictions(no modules of the same type for ex., though i think better restriction could be created).
Modules are craftable aswell, recipes are found in the core/dungeons, materials for most modules are found in the core, materials for better modules are dropped from dungeon bosses.
So players, that want spend more time farming, can create cusom weapons/armors that they like more but that won't be strictly better than existent armors/weapons.