Yeah but in Mac there is not such thing as user.cfg in the config folder. But in any case, I try with the local.cfg and default.cfg in the same folder, later changing the line in default.cfg (I know is no recommended to do that), and then I erase default.cfg and left local.cfg and vice versa, and nope, no changing in the game. ANd now, I did what the default.cfg file said, and I have the two files, but anything change.
So, I try every combination, changing the line in one file, in both, with just one file, with both, and nope