I really do wonder who I would ask about making a mod or cheat for Okami - any version - that makes the first-person camera toggle-able and doesn't lock movement/other actions when its active.
When playing the PS3 version I found you can enter first-person in battle, and even switch when you're still drifting in motion or attacking, just not do anything else until switching back. So I think such a mod should be possible, as the functionality seems mostly there, just disabled.
The PS3 version would be the most accessible version as I have it, I would just need to set up emulation on my PC.
... oh wait, though, hm. The PS3 disc is a blu-ray, and getting PCs to read blu-rays is notoriously a pain. Moreover, my new PC doesn't have a disc-drive, I'm pretty sure my external USB drive is DVD-RW only.
I suspect in terms of modding, the PC version would be the most open.