Thanks Garacesh, boot and Mavhc.
Boot, would what you wrote above mean you I would not even be able to access "start-up settings" as well? Meaning it would block safemode too? It just blocks it all....
Also, I read that it's also possible to enter not just with SHIFT- RESTART, but also by clicking the power button, then pressing SHIFT, then ENTER.
Is it the same?
Would bcdedit/deletevalue {current} recoverysequence block that too?
(I'd test, but I haven't installed Win 10 yet).
Thanks again for all the help!