Even after completing World Tour Mode, there are more ISM Plus upgrades to unlock for your World Tour character (or to be used for any character created in Edit Mode). To unlock these, save your game after completing World Tour Mode and register your World Tour character in Entry Mode. Now use that character in other modes to unlock the ISM Plus upgrades.

Effect - Code

Alpha Power - Beat Survival Arcade Mode with a World Tour character.
Custom Combo Charger - Beat R. Dramatic Mode with a World Tour character.
Multiple Taunt - Beat Final Battle Mode (hold L+R when selecting mode) with a World Tour character.
Status Plus - Beat Arcade Mode with a World Tour character.
Super Alpha Power - Beat Survival Original Mode with a World Tour character.
Supreme Alpha Power - Beat Survival Boss Mode with a World Tour character.