Hello Enjoyneer,
None at all - you need to have some patience, this is not a full-time job, you know. :)
If I understood exactly your idea, you are suggesting to have a kind of modifier key that when pressed would act as temporary toggle for making any pasted ghosts unapproved?
I would actually need to think a little bit about this one and see if it is even possible without interacting in some weird ways with the other shortcuts (there's only so many modifiers available in the game).
As for being confused which mode is currently on... If the button is pressed (yellow-ish), the ghosts are auto-approved upon placement, if depressed (greyed-out), the ghosts will require manual approval when placed.
Best regards,
Branko