Well I manage to get my French keyboard working as I want.
For anyone who want a smooth scroll I found a very nice freeware called "MOS" : https://github.com/Caldis/Mos/blob/master/README.enUS.md
For the keyboard backlight we can only toggle it on when AC is plugged.
My e7450 works like a charm now... until I found an issue . Thank you for your work bro !