This can't be good for the game..

[palistov]

Never played F.E.A.R. but using a NMap for a specular shouldn't cause an issue. The brighter the bitmap is, the shinier the texture is. Doesn't really matter what color it is. It may not look as realistic ( to be honest it looks metallic, whereas I'd expect that tile to be ceramic) because now every single blemish on the ground is highly accented with the specular, but hey it gets the job done. I personally think powerful specular maps like this are best use to help simulate tarnish or on surfaces you'd expect to be covered in water. Other than that you honestly don't even really need them.