I find this one useful for fishing. It lets me use the space bar to "click" the bobber once I catch something:
Code:
/run df = DEFAULT_CHAT_FRAME; key1 = GetBindingKey("JUMP"); if (key1== "SPACE") then SetBinding("SPACE","TURNORACTION"); df:AddMessage("You are now a man of action.") else SetBinding("SPACE", "JUMP"); df:AddMessage("Your legs are no longer broken.") end
(Unbind the NUMPAD0 "Jump" action manually before using.)