For anyone using the Logitech Wingman software, there's another easy way around this, that i prefer to AltTabbing.In LFs, set the flash lights on button to a button on the keyboard that doesnt get used much. (I had it set to G, but this caused problems when i typed a mesage, as you'll probably come to understand)
So anyway, say it is set to G, go into the wingman profiler, and choose your lights on button, choose to record a command, and press down G. now, click to stop recording, and then lift off g. The action of pressing down G would have been recorded, but not the lifting off. So obvously now, when you press whichever button you assigned this to, it will be like you're constantly holding down the G key. This obviously posed problems when typing a message, so perhaps the shift button would be a better assignment. then just record the lifting off of the g key as another control, and map that to your lights off button on the wheel. Works for me anyway.
Sorry if that was hard to udnerstand, basically, go to New Command. Click record, press down the key you've assigned as your light flash in LFS, click stop recording with the key still held down.
hope that helps.