Keybindings screen has special modifiers for few actions as Throw gets activated by clicking G and Drop gets activated by holding G
Those special modifiers disappears as soon as user starts to edit keybindings thus making it quite hard to create reasonable keyboard controls when user don't really know which action is required to Hold button down and which can be merely clicked.
Also Raise Modifier does not indicate that by clicking user enters ADS mode directly but holding Second Mouse button user only raises weapon and lowers it when second mouse button is released. Quite confusing.