well kol is hard for some , however it is possible to make work with right crue.
what is needed people experienced in database editing, skill with stored procedure knowledge, understanding what each table , column , and row is for. and how it works with the server.
someone skilled in decompiling and hex for the server files it self .
people that are skilled client editing and have the necessary tools for translating useable clients , editing adding npc, skills, monsters and items from client that normally dont have them for example adding rofd material to a ke client.
from what i learned in ko development its takes more then one person, trying to do everything you get burned out that way ,
just some advice no need for you super user to try to flame.