How can I tell MDT to use the efisys_noprompt.bin as the bootloader used to create the litetouch.iso

I would like to have an iso file that does not have the "press any key to boot from cd/dvd" prompt. I know how to do this manually but I would like to be able to set this somewhere so that MDT will use it whenever the iso is updated. Is there a script file somewhere with the command given to oscdimg that can be edited?