The chapter about making bootable media using downloaded ISOs currently only has instructions for a command line on Linux and Windows. The Fedora LiveUSB Creator tool has recently been updated and can now use direct write (dd) - we previously didn't document it because it wasn't capable of that and was therefore unreliable, but now it should be safe to document. The release announcement, including links, is here: https://lists.fedoraproject.org/pipermail/devel/2015-November/216327.html