Disables F8 key during boot time
You probably know that you can access the Advanced Boot Options menu by turning on the computer and pressing the F8 key before Windows starts. DisableSafeMode will prevent this; nobody will be able to start your system in Safe Mode or in any other repairing/debugging mode.
Disables F10 key during boot time
Once you are here, you can easily replace /NOEXECUTE=OPTIN parameter with eg. /SAFEBOOT:NETWORK and start the system in Safe Mode with Networking.
DisableSafeMode
will protect your system against this scenario.
Disables Windows Error Recovery screen
Just try to power off your computer and plug it back again. Windows will try to protect the system by letting you (or anyone else) to enter into Safe Mode.
DisableSafeMode
will give you the real protection in this case.
Disables System Recovery Options
No one will be able to access options menu shown above and start System Repair or System Restore process since DisableSafeMode protects your system from that kind of trouble.
Enables clean Windows boot
The final goal is to sit and wait for your system to start ...
DisableSafeMode
will enable that joy.