A full on-screen keyboard that can be summoned anywhere helps a lot. On a 13" device there's no excuse to not have Ctrl, Cmd, Alt, Tab and Shift keys, complete with escape and the arrow keys.

It can be reduced in portrait mode, but should be there in landscape at least. That gives intuitive and ultra precise navigation, standard copy/paste, word by word navigation, fast and precise selection etc.

And it's also super helpful for selection even outside of text fields.