Just started playing this and discovered a problem with Pimax hmd and Index controllers.
You can’t activate the mods plasmid menu or activate a grenade. In an exchange with the mod’s author it appears the grenade button (left hand B button and grip squeeze combination) won’t activate the plasmid menu. as well that grenade button won’t activate a grenade. This appears to be a difference in how the Index controllers work with a Pimax vs Index hmd in this mods implementation.
You can get by this and play without plasmids. You need to shoot the targets in the plasmid tutorial in the first level to activate the exit using tutorial exit button on the wall as well as activate the next door.
If you pick up a special weapon you can’t drop it as you need the grenade activate button to do so.
You can grab and throw back an active grenade thrown at you.
You can carry a grenade and throw it near an enemy and shoot it and it will explode, but you can’t store it in your wrist pockets.
That’s all I know so far.
Oh and you can’t play this with Sword as they don’t have a B button