Another one: we've had a few emails come in backing up some forum comments that suggest that the back button on the main screen ought to reopen the keyboard rather than closing it (since the keyboard is open when you initially open Pleco), and only exit the app when you press it with the keyboard already open, so some opinions on this would be welcome too. We've already made this an option for 2.3.8, we're just weighing whether or not to make it a default.