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Info concerning the coding standards used:

When a variable ends with _num, it is most likely a size for an array
All chXXX_Y_ are an array of 15, 31
When a variable contains _WRK, it is most likely a struct
When a variable contains _CTRL, it is most likely an enum for control
When a variable contains cmp, it is most likely indicating a function for compressed data

General useful information:

The PS2 DVD sectors are 2048 (0x800) bytes
PCSX2's base address is 0x20000000

Files

For each file:

4 byte - LBA
4 byte - unpack file size
4 byte - file size in archive

Calculation of real LBA:

real LBA = (LBA bitwise shift right 2) * 0x800

Value of right 2 bits of LBA is:

0 - no file
2 - file not compressed
3 - file compressed

File ID:

0x1064 -> subtitles

File Types

0x2 -> MDL?
0x3 -> FULL TIM2 (not in model archive)
0xC -> str
0xD -> DXH
0xF -> PSS

Fun With Cameras

Address of the pointer containing the current camera's properties 0x003420BC

Uncensoring the USA Version

If a +1 is applied, then you can play as the sister
The game applies a +1 to the selected costume for the sister
Possible to load Plyr as Sis by giving Mayu's costume ID, which is just a '+1`
Possible to load Mayu as Plyr with same logic

Fatal Frame 2 USA

Menu address of current selected costume 0x00409125

Mio (First sister, referenced in code as Plyr)

Mio's selected costume address 0x00408f40

Mayu (Second sister, referenced in code as Sis)

Mayu's selected costume address 0x00408f44

(Costume Values)

NORMAL -> 0x00, 0x01
G -> 0x3E, 0x3F
H (BLOCKED) -> 0x4C, 0x4D

Fatal Frame 2 JP

Mio (First sister, referenced in code as Plyr)

Mio's selected costume address 0x00408500

Mayu (Second sister, referenced in code as Sis)

Mayu's selected costume address 0x00408504