Good news, pals. Decided to share 
As for me, no other "feature" of Boot Camp on Macbook Pro is as annoying as the poorly coded keyboard backlight management. Today I found a program which finally fixed Boot Camp's buggy implementation for me (I use Boot Camp 3.1 / Windows 7 x64, mid-2009 MBP 15"). Software name is "Power Plan Assistant for Windows 7", so I'm unsure would this tool work on other MS systems. Here is the copy-paste of publisher's description (look at http://www.powerplan7.com):
Not a secret, Boot Camp's native Macbook Pro / Air keyboard backlight management has several issues. This becomes especially clear in comparison with Mac® OS X implementation: not only it's impossible (!) to disable keyboard backlight completely in Windows®, even worther thing is that Boot Camp's native automatic adjustment mechanism is not properly coded. It's, as a minimum, too sensitive, thus keyboard backlight tends to fluctuate even at a nearly constant level of ambient light. Being extremely bright, especially on the latest 'unibody' Macbooks, it doesn't only irritate user, but definitely is an extra energy consumer.
Power Plan Assistant brings the keyboard backlight management to a new level on Macbook Pro / Air, allowing the user to disable keyboard backlight completely or just disable / enable automatic keyboard backlight level adjustment. These features were previously available on Mac® OS X only. Power Plan Assistant brings them to both the 32-bit and 64-bit Windows®, at the same time preserving all of Boot Camp native hardware controls (no need to unload the 'Bootcamp.exe' process!)
As for me, no other "feature" of Boot Camp on Macbook Pro is as annoying as the poorly coded keyboard backlight management. Today I found a program which finally fixed Boot Camp's buggy implementation for me (I use Boot Camp 3.1 / Windows 7 x64, mid-2009 MBP 15"). Software name is "Power Plan Assistant for Windows 7", so I'm unsure would this tool work on other MS systems. Here is the copy-paste of publisher's description (look at http://www.powerplan7.com):
Not a secret, Boot Camp's native Macbook Pro / Air keyboard backlight management has several issues. This becomes especially clear in comparison with Mac® OS X implementation: not only it's impossible (!) to disable keyboard backlight completely in Windows®, even worther thing is that Boot Camp's native automatic adjustment mechanism is not properly coded. It's, as a minimum, too sensitive, thus keyboard backlight tends to fluctuate even at a nearly constant level of ambient light. Being extremely bright, especially on the latest 'unibody' Macbooks, it doesn't only irritate user, but definitely is an extra energy consumer.
Power Plan Assistant brings the keyboard backlight management to a new level on Macbook Pro / Air, allowing the user to disable keyboard backlight completely or just disable / enable automatic keyboard backlight level adjustment. These features were previously available on Mac® OS X only. Power Plan Assistant brings them to both the 32-bit and 64-bit Windows®, at the same time preserving all of Boot Camp native hardware controls (no need to unload the 'Bootcamp.exe' process!)
