Earlier quoted context omitted.
Unfortunately, no. I belive it is first a conflict of policy: the USER needs to have more privileges than SYSTEM in order to suspend execution of all (including system's) processes. WinNT is a multi-user OS. Nobody would allow the user to DDoS the system, even when that user has direct access to the reset button. A second problem is that WinNT probably can't even open the Task Manager if some system processes are sus…
I miss the magic SysRq key... Xorg / graphical systems blocked it decades ago, I've forgotten how to invoke it without looking it up, though I do remember REISUB. The security perspective of the SysRq commands is: a human is on a hard-wired console. If they want they can pull the power or press buttons on the outside of the PC that aren't on the keyboard. It's probably OK to obey some small list of actions that are u…
The funky part would be the user space integration, the kernel would probably have to selectively resume a couple key processes or take over the display with its own/embedded one. Sounds like too brittle and/or extra bloat.
I never thought I'd consider Windows 95 technically superior in some area, but holy hell that system ran in 4mb of memory and did one (even if only one) thing right.