We have also thought about a walkaround and I think this is a really great idea. I'm not sure when this will be added.
Creating a new aircraft like the F16 is quite a bit of work and personally I have the feeling that we already have quite a selection of fighter jets and that maybe a different aircraft category should get more attention. Military aircraft documentation is also usually not as easy to come by on the internet, which adds another challenge for us.
I hope the walk around feature gets added to fs 2023 and I hope that there will be an f-16 in the future since its my fav aircraft