Add sysctls to allow enable/disable some keyboard combinations.
Yeah, I think that this description helps. For instance, I don't know the combinations for reboot/halt/poweroff :) I thought Ctrl-Alt-Del was handled by init(8) but I may be wrong and simply confuse with Linux.
Regarding the text, I like your second suggestion, "... (by default, Ctrl-Alt-Esc)".
Thanks, the description is way more helpful like this.
Just a minor comment: I would move the "(typically ...)" brackets after the "See kbdmap(5)" but before the final ".":
VT_SYSCTL_INT(kbd_reboot, 1, "Enable reboot keyboard combination. " "See kbdmap(5) to configure (typically Ctrl-Alt-Delete).");
And don't mix single-space and double-space after a ".".