Even with the base game weapons, I can pick them up and throw them around but no matter I can't actually add them to 'inventory'. Doesn't matter how many times I hit my +use key, IT DOES NOT WORK. Even if I set the whole 'auto pickup' thing where I just hold my +use key, IT DOES NOT WORK.

I even disabled my weapon drop addon in the case there was a conflict and it still does not work. As far as I can tell this addon is completely broken.