I have never heard of such a thing on a software level, but I haven't messed with Fedora in over a year and have no way to look. Given the extent to which Linux users rely on tools such as ssh and scp, I would find it mildly surprising to find such a setting. If I'm wrong, I'm sure someone will set us straight.
I think it's more likely that there might be a BIOS setting that needs to be changed to allow headless/keyboardless operation. I have seen such settings in BIOS.