Installation instructions (stable 7435):

1. Download SCI_7435_sevenfm, containing all needed files and options.
Just copy it over your new ja2 installation and run new exe.
Warning: do not run vanilla exe in your mod dir, as it can damage your installation.
link removed
You can also download this small modpack (Wildfire6.07, Arulco Revisited 1.4), copy it to your mod dir, select mod from ja2.ini or IniEditor and play.
link removed

2. There is a Data-User dir in the SCI, which containt the following:

TableData:

Interface - background pictures for widescreen interface, bullet images

ExtImages - custom big images, currently only for ak-103, HK 53, M870 and Ithaca 37.

INI files:

Ja2_Options.INI

ADVANCED_NCTH_INFO = FALSE
Enable it to see additional NCTH info

USE_EXTENDED_ITEM_IMAGES = TRUE
Custom images - you can see them in extended widescreen interface, attachments interface or in magnified sector inventory

EXTENDED_TACTICAL_INTERFACE = FALSE
Not implemented yet

EXTENDED_WIDESCREEN_INTERFACE = 3
0 - disabled
1 - only background
2 - mini - show only item pictures and names
3 - full info

EXTENDED_WIDESCREEN_AMMO = 3
0 - do not show
1 - show as numbers
2 - show as default bullets (same as in NCTH cursor)
3 - show as small bullets (stock calibers only)

EXTENDED_WIDESCREEN_SHOW_GRENADE_IMAGE = TRUE
EXTENDED_WIDESCREEN_SHOW_SCOPE_IMAGE = TRUE
EXTENDED_WIDESCREEN_SHOW_MODE_IMAGE = TRUE
Additional options for widescreen interface

IMPROVED_NCTH_CURSOR = 1
0 - default cursor
1 - improved cursor: laser dot, scope mode icon, show extended AP info, limit maximum shown aperture size (optional)
2 - compact cursor: mounted indicator, aiming levels as numbers

IMPROVED_AUTOFIRE_CURSOR = 2

DISABLE_BADCTH_QUOTE = TRUE
Disable potentially annoying 'No line of fire!' quote

IMPROVED_NCTH_APERTURE = TRUE
More wide (sqrt) bullet deviation when firing beyond weapon range.
Vertical distribution is limited to 0.5 - less ground hits.

IMPROVED_TRACER = TRUE
Use red trails for tracers
Disable light for tracers

You can delete those files safely if you don't need them.

3. Additional info:
Hotkeys:
[x] - go prone, same as [p]

Feedback, constructive critisism and suggestions are appreciated.