I posted a beta release of Aridia 1.2 here:
http://www.huguesjohnson.com/aridia/
This features a rough draft of palette editing and a lock-down of the item editing feature. Due to a bug in the game, items can now be edited but not added. Well, I guess I can't call it a "bug" in the game since the original developers could never have expected it. Anyway, it turns out changing the item count in the ROM causes other statistics to be modified at runtime when the character is loaded.
I usually don't release untested betas like this but made an exception since it will take a while to finish the palette editing... by "finish" I mean "identify all the palettes".
Feedback and bug reports are always welcome