With this question I just wanted to make sure that there was an option somewhere that I didn't know about.
Thanks for that detailed answer, maybe I'll add an enhancement request, then.
I've already saved plots will ggsave(), this is easy and convenient.
But sometimes when I go through a list of older plots inside the rstudio "Plots" pane, I discover some older plot that's worth saving/printing for some reason. In this case often the codechunk containing the ggsave call has been changed in places, and undoing the changes is not really possible. Then I wished printing as A3 would be easier.