If you try to change the Tiling/Offset using the standard shader for the main set of textures, it will not work. The detail texture tiling works great, but the main tiling & offset inputs do not. If you change the shader to the legacy diffuse shader, set the tiling to say, 5x5, and then change the shader back to specular it will keep the 5x5 value, but the tiling & offset inputs do not reflect that/affect it.
Just a small bug thats been a pain.
