After a long battle I have finally managed to get some working useful mods for One Piece Treasure Cruise!
Mods available right now are:
Huge HP Mod - Your Crews health is 1044480 (regardless of the fact that it displays as 999999)
Instant and Unlimited Skill - As the description says, all characters start with their skill at MAX, and does not revert back once used.
However, I also have an attack mod, which only applies to skill with a damage multiplyer. So no more being one shotted by the enemy when being caught out by a pre-emptive strike like Buggy's.
Demo can be found here - https://youtu.be/GKGpRKuLXcI
You can get the mods from here - http://www.guyver4.co.uk/optc