After some research for my G27 I've found a plugin to operate LED.
Logitech G27 Leds Plugin 1.0.1 by Fazerbox
This plugin permits games like rFactor, Superleague Formula 2009, GTR, GTR2, GTL, Race and Race07 to use G27Leds. It was developed using Logitech Wheel SDK and was tested only on rFactor and GTR2. In others games it should not work properly.
I seek the same thing for live for speed if someone has found?