It's on the list of features to look into in the future, just not something that I can add quickly so I did the layer copy for you first.
Also, most users apparently aren't working with images
that large
(and want to use tools across larger-than-view areas at the same time; those that do generally work on pieces at a time)
I know you've also tried using the smallest font provided, and while it's not always convenient there's another option that could be useful in some situations: temporarily use an even tinier custom font to get a very large view area. Like... 4x4
(something larger than this might be more appropriate depending on your needs, but I happened to have this file here already, having used it before for something else)
Short of that, having a large monitor is nice, too