WildStar does not currently have a way to keybind Need, Greed, or Pass on loot rolls. I created this addon to provide slash commands for Need, Greed, and Pass. These slash commands can be put into a macro and placed on an action bar. The action bars are able to have a keybind.
I personally have the action bar keybinds mapped to buttons on my mouse for quick greeding and needing.
The commands are /need, /greed, and /pass.
It is designed to work with the default NeedVsGreed addon from Carbine. If your favorite loot addon disables the default NeedVsGreed addon, this addon will not work. You can ask your favorite loot addon author to take what I have done and add it to their addon.