Hard-coded - Game feature which cannot be modded. Usually features desired by modders, but unfortunately unattainable. See also punishment of Tantalus (2)

(2) Tantalus, who enjoyed the confidence of the gods by conversing and dining with them, shared the food and the secrets of the gods with his friends. The fitting punishment was to be immersed up to his neck in cool water, which disappeared whenever he attempted to quench his thirst, and lucious grapes above him that leapt up when he tried to take a hold.

EDIT: Am I being slow? What is TIC?