I know its a bit late, but i never had a ps2, and after that skipped on 3 untill few days ago when i got an used ps3 with plenty of games.
I love how much MGS3 is over the top, with Ocelot meowing and such, but man do i miss crouch sneaking and over the shoulder aiming from MGS4
The only version of MGS3 to have crouch walking was the 3DS version. The pressure sensitivity on PS2/3 was to control whether you’d aim/shoot, and hold someone/cut their throat. You could walk quietly by using the dpad