Using /EFI/BOOT config files for auto-boot

[Nerdworld]

Hello!

I'm using Kali 2.0 on a 32 GB USB 3.0 stick on a Lenovo Z50 laptop running Windows 10 on the HDD.
Boot hierarchy: USB > HDD > CD > Network

So when i have my Kali stick plugged in, it boots from USB. (otherweise the only way to get into Lenovos bios or boot menu is to use the recovery button when the laptop is completely turned off).

I also figured out how to configure the boot menu from Kali with mounting /dev/sdc2 and editing the /EFI/BOOT/menu.cfg files, which allowed me to remove the annoying bell / beep on startup:

menu hshift 0
menu width 82

menu title EFI Boot menu[0x07 BELL ASCII CODE REMOVED]
include stdmenu.cfg
include live.cfg
include install.cfg
menu begin advanced
	menu title Advanced options
	include stdmenu.cfg
	label mainmenu
		menu label ^Back..
		menu exit
	include advanced.cfg
menu end

menu clear

Question: How am i able to setup auto-boot to "Live USB persistance" mode (instantly or after x seconds)?

Thanks in advance,
Nerdworld

Edit: The bell ascii code reappeared after reboot.