Updated for Fall patch, game version 1.0.0.38
Files updated: InGame.lua
Notes
This is now packaged as a regular mod, so no need to overwrite the base file.
Updated InGame.lua for the Fall patch and removed the yield icon key. Firaxis hooked up their own key, which you can assign in the keybindings menu. The default is (surprise!) Y. I don't think this made it into the patch notes.
For whatever reason, they also gave it a generic sound effect. Click! If you don't like the noise, just remove the block comment in InGame.lua to re-enable the function from this mod... it should take priority. You could also edit the new key function in WorldInput.lua and remove or change the audio reference.
I'm expecting we'll get the R key for Christmas