Thank you all for feedbacks
The colour selection box is probably the most buggy thing of the soft ^^. I have decided to code a new one, to have exactly what I needed, but I had a lot of bugs to correct, so I just corrected the most importants. If I had corrected everything, you would not have had the software so quickly, because I always found something to improve, delaying the release date. Khamúl will attest .
There is technical reasons for the 21 points . And yes, the more points added, the smoother it is. I made that choice to avoid the previous bug of WMT, that added sometime some points in 0 0 0. But I will see that later.
If you port to another area with the light enable, the colour will be dark. But I think you can just disable then enable.