With a pointing device on iOS 13.4 you can swipe to go back in a UINavigationController FROM ANYWHERE (not just from the screen edge). So good.

1 day later: I can confirm that on iOS 13.4 it’s possible to zoom with the combination of 1 finger touch and 1 click and drag on the mouse. 😆

4 days later: Terminology note: the shape of the iOS cursor when over text is not an I-beam shape any more than a triangle is a circle. An accurate term would be something like bar, pipe or line.