Much like the menu key, RagdollKeybind uses RegisterKeyMapping. By default It is set to U server side. To change the keybind change the default U value in FiveM keybinds found in the settings menu within the Esc Menu.
Ragdoll Options
An option to toggle whether ragdoll requires a single key press or the key to be held is found under
config.lua
RagdollAsToggle=true,
Changing the value to truewill enable a toggleable ragdoll, changing the value to falsewill require the player to hold down the assigned ragdoll key.
RagDollAsToggle only works if RagdollEnabled is set to true.