I've always noticed that in the controls menu, there is command for "Grab" binded to G by default.
I've walked around the campaign levels and can't find a single thing to pick up or grab. I also tried in multiplayer, a friend and I couldn't find any use for it.
Is it safe to assume that the Grab feature is an unfinished feature, so it doesn't do anything, sorta like the ShadowCloak in the first Blood?

There aren't any items I can recall the respond to the "grab" command. If you look at the player character model's stabbing animation it begins with the actor reaching out as if to hold victim/target. My guess is they had planned to use shogo's tractor beam code at one point to let player /enemy snatch a target and hold them while stabbing.

Oh wow, that would have been a nice feature. And yeah I have noticed the character's stabbing animation looks like he's reaching out for something . My first thought was possibly picking up random debris around the map and maybe throw them, but that seems a bit stretched for this engine. Thanks for clearing that up.