Hi Paolo,
I will have to get back to you on the LED color question. I'll be out of town for the next week and won't have access to my NEO sample. We've often been critical of the color picker implementation in the Control Center of this ODM but it's relatively unlikely that this will be improved in the current generation. At least some direct RGB input would be nice.
To your second question: well, a "clean" installation is describing just set: nothing stays installed. In this case you should re-download the drivers from
here.
Cheers,
XMG|Tom