This is confirmed working in the shop menus, the item and warehouse menus, the equipment screen, and the hospital. It will not work in the bonus menu for obvious reasons (no cursor). The item must exist for it to be changed. That is to say, you can't change slots labeled with the (None), (Weapon), (Other), etc. placeholders. Just buy a cheap item and go to work on it.

Oh yeah, and the items are created afresh each time you come to them. That means different specialists and rarity. So if you come across one you like, you probably should stop. On the other hand, if you hit one that's kind of a dud, you can just advance one and go back. All the variable data will be generated again.

Some notes:

• When you add a skill, it creates a test skill on your character. I haven't tried to use this, but I don't think it does anything. I did it this way because the skill cannot exist in order to add it, so I needed one that wouldn't be desirable.
• You can only add one skill at a time. You have to modify the new one to something other than "Test" before you can add another.
• You can only have up to 96 skills on any character.
• The "Bonus Blast", "Midare Fubuki" (digit 041D, there are two copies), "Kero Change!", and "Prism Justice" skills are skipped, because they are not displayed on the status menu. The skill will disappear and become inaccessible if set to these values.

This code would have been relatively short, but for the stupid "invisible" skills.

• Pressing right on the d-pad will allow you to modify the specialist's type. You can modify them to any available type, except "Jobless".
• Press R1 to increase the specialist's power by 1.
• Press start to increase the specialist's power by 50.
• Press R3 to increase the specialist's power by 500.
• Press L3 to set the specialist's power to 1.