I have copied all the contents of the bootloaders directory from /usr/share/live/build into my config directory. I have also changed the first 3 entries from the syslinux_common file. However there seem to be files for the installer: install_gui and install_start_gui. What is the difference between the 2? I understand that the "start" file is the main menu and the other is the sub menu... but I cannot see how one is linked to the other?
How can I avoid sub menus then?
Also, I can find no entries for the grub menus and in fact if I boot the ISO in EFI mode from VirtualBox, I get the default grub entries and not my modified menu. If I boot normally without EFI, the menu changes.