Hi Abbie,
That's a good suggestion, and one we likely would consider. Would you be willing to write up an issue requesting it on our tracker at:
Issues · nvaccess/nvda As a feature request, you don't need to provide as much information - though citing the example of the group page here would be perfect as it gives a real world example of where a keystroke would be useful.
We use GitHub for tracking issues and basically any fix or new feature which gets into NVDA starts out as an issue there - hence, I can say it's a great idea here, but it won't get in front of the developers without a suggestion - and while I can write it up if needed, the benefit of you writing it up is that when the feature is just about ready, they will likely say here is a test build, can you please download it and see if it works? (and I will have forgotten who suggested it by then, because I am very forgetful).
Kind regards
Quentin