I actually checked some of those things already, the painting was confirmed by developer to be for a future update if they can think of something. Tried unlocking the achievements too through a save editor, even finished the game on extra difficulty with cheats. Nothing. The new attacks are just some stuff like Chloroform that inflicts RES damage instead of HP one.
Locked chest only contain the best weapons for characters.
I was asking if you found something else, cause when I skipped 90% of the content with cheats, I locked myself out of the ending for a bit. When save editing I saw a flag called CGEventViewer and was confused, since most other CGs had theit own separate flag and this was off, so though it would unlock the second floor or something so you can see chars in diff states without the tedious gameplay.
Thanks for the decryption tho, it helps and fits my purposes better. Never really figured out how to decrypt .rpgmm files.