In an interview I can't find anymore a developer from Farbrausch said that they used such a method to optimize the .kkrieger demo and ended up having a bug in the main menu because while recording the coverage the user never scrolled to a certain main menu item. So once you scrolled there you couldn't scroll up anymore.
This reminds me of Naughty Dog overwriting standard library functions to gain more RAM for Crash Bandicoot. They would just “delete a function and see if the game still worked.”
