Default Retroillumination level

I am using miui 2.3.7 from months and I notice that in display settings, sensor (filtred/raw) is usually 10 in low light conditions. So if I set for example 50 for level retroillumination, I had the same illumination of the screen in a totally dark room and in twilight light in outside. This is annoying because I want to set lower level for the first situation and higher for the second. A solution can be to use manual settings but if someone have an idea on how resolve the automatic levels I will be glad. Thanks
HTC Desire PVT4 - My dropbox floder