vti7 image and multiboot ?

Hi all
The new vti 7 is supposed to support multiboot.. but the BIG question is how?
i been looking at the menus but nothing or is it hidden somewhere ?

I got this installed, added OpenA.TV-4.2.zip, installed it via menu, but session stopped. i had to power off manually and start it up again.. the image is there when i look but only a few files and folders..
Does the vti image need to be stripped for plugins AND does it need to be on HDD only ? I am running it on usb pen..