set image alpha chanel as specular intensity map in 2.67

i have a diffuse texture, and its alpha is a specular intensity map.

in textures tab, theoretically i have to check two check boxes in influence section: diffuse color and specular intensity, because a developer is saying in here that “if Alpha is enabled for texture, then alpha would be used as influence on Specular intensity”.

but when alpha is enabled, it also affects the texture diffuse colors.

is this some kind of bug or something(regression)?

i could create two texture slots, and use in one slot my texture with alpha disabled for diffuse color, and the second slot with alpha enabled for specular intensity only. but in 2.67 alpha is enabled/disabled per image and if i enable/disable alpha in one texture it’s automatically enabled/disabled for all textures that use this image :frowning:

help please