So I spend the day testing different ISO flavors and way to configure Xorg. To anser Tom, yes we could go back to a ncurses lang/kmap config but I would prefer a GTK configs via tazbox.
This time I still include Xorg with DRI but Tazbox start Xorg with the option -nolock and Tazx confifure Xorg on DISPLAY 2 to avoid any conflict. Work for me but I need you to test it on your hardware.
Also a few Desktop polishing such as a new logout icon on the top right and remove logout function from Applications menu, new icon for TazPanel and TazWeb. And finaly please welcome Sakura Terminal in core, it's a much easier Terminal than Xterm with transparency and right click options to copy/paste commands.
As suggested by Mojo, we could go back to a simple Xorg and Vesa drivers without DRI, the nv and intel driver. Any opposition ?