Situation: hover over a hyperlink. You want to read more so you click "Jump to reference". Is there an easy way to get back to your original book? The only two ways I have found are to set a bookmark before jumping, or using the History panel.
We are currently working on improving support for the back button to function more as you are describing. This improvement will be pushed out in a future release.
Thanks,
Tap the screen to bring up the controls, then press the on-screen back button.