Create bootloader manager in python that customizes the list of operating systems, change the appearance (applying some theme colors, splash screens), and change some behavior( like timeout, etc).

This manager is first executed as an the installation step, in a more simplistic way, and permits the user choose the color the, the splash screen, the default operating system, timeout, the order operating systems and so on...

Then it keeps a shortcut in preferences menu, where the application can be executed, and the settings o bootloader can be modified.