Confirmed so far:

Number of save slots V1.0 - 1 V1.1 - 10

Golden Guns v1.0 - Simple texture edit v1.1 - A shiny texture edit, the entire gun is made out of gold

Golden Omega Armour V1.0 - Does not exist V1.1 - Does exist to the far left, it does not add item%, you still need regular Omega Armour to pick up the other V5 components but golden armour can pick up grenades in mini-trap area where Claire gets taken away, skipping the first spider boss in NG+ Any% runs

With the Z-slide + ground pound combo, you can get grenades without picking up a gun, actually it is possible to complete the game without picking up any kind of gun at all which leads to a funny ending.

Strange side effects includes:

¤ Foam is locked to 1 direction, aiming towards the background, trying to exit the early foam tunnel is tough due to this restriction. This restriction also allows a new kind of corner warp where Jason has to be right next to a wall or door, shoot some foam towards the background WITH A SOLID WALL, then once the foam gets really close to Jason, jump and climb forward to zip to the far right!.

¤ TORCH MISSILES! Because Jason does not have a gun, he cannot aim at enemies in the far background, so you have to go to the room that has a staircase (just after 4 big lasers) and Z-slide around that, then go out of bounds and go to the far left, you'll either end up in the armour mech room or the save room just before Friction Dampener.

Slow load abuse is required to get Triple Jump before Walker.

Can also confirm that the spider boss time save (jumping and shooting to advance in the cutscene) doesn't work, Jason just hits a box and falls before.