It read like it was a big step to offer Mouselook. I haven't read that a developer has allowed mouse control since what, early 90's?
Nah, I don't think that's what he was saying at all. He needed to mention that adding mouse and keyboard controls makes the game feel different to justify his dumb reasons for not going all-out on the port, but I think he just used allow to mean "you have the option to". It's a given with PC games, but it's definitely something that needs to be added when porting to the PC.