I answer a little,
for cash shop items need some fixes and 1 program more.
For wars, you can copy from holley and link on default script file and voila! minor fixes todo, only the mob names not match for spawn of mudwall for war and same for Gates on Sabuk, its not a secret, this can be added in 1 day fine.
For quests, yes, have 5 or 6 quests broken, but not important ones.
For item duplicacion there is because official gsp checks have bugs on sql, on this you can add more checks to sql by modifying the storage procedures.
Same as level cap of 56, you can raise up to 255. check msp_characterlogout i think is the correct name.
Numa hill can be added easy.
Same as crafting items.
and yes, only big todo i thi k is to balance a little the drops and items or some mobs, because on ice or snow the mobs are perfect killers if you dont have the wecash potions to stop frezze of ice effect, this can be adjusted on mobs to made a more playable cave.
I think i dont miss anything more about. :P