For models that do not offer, expose or otherwise support 'UEFI Boot Path Security', such as the Latitude E5x40/E5x50:

With the active boot list set to UEFI and legacy ROMs disabled, how does one best secure to F12 boot menu/boot options in general and prevent booting from anything other than the Windows Boot Manager or internal hard disk? Attempts with Command|Configure have not yielded the desired results...

Thanks!