Ok the only way to do this (and you have to be comfortable using SH3 Mini Tweeker
http://www.delraydepot.com/tt/sh3sdk.htm )
The file you will need to edit is cameras.dat (tweek file cameras_dat.txt)
The catagory you want i think is FreeCamera FreeMove.
The rest you will have to figure out for yourself
Btw ya should have posted this in the SH3 Mods Workshop forum as this is a modding question