Patch: Custom Items

Nice patch, this is really useful. Are you saying that the expendable items shouldn't be edited for any reason, except for the HP/MP healing ones?

They can be edited. However, it is possible that the items have hard coded features implemented on them and they can't be removed without assembler modification. You can think as if specific items have a special behavior, different from the common behavior, like a exception.

Rename card triggers the rename screen window. Tent availability is determined by the save points and also triggers a cinematic when used. Warp stone availability is determined based if the user can escape the dungeon, etc. All these features are hard coded by the item identifier and not the item data.

Based on whatever item you want to create, you should be careful about what item you want to replace with a new one. If there is no hard coded features, any item can be edited. Unfortunately, those hard coded exceptions are scattered in the game system and are difficult to track or predict.

The easy way is to edit only the most common items. Special items, like rename card, tent, warp stone, etc, should be avoided. But you can always edit them and check if they work as intended. Just take in consideration that these hard coded features may or may not appear in your new items.

I'm wondering if someone shouldn't make extra shields, etc. from those item slots if you know anything special about the game system.

You can do it, as long as you take in consideration the hard coded features of the new item.