Thank you.
But wouldn't it be difficult for you to reproduce my results because font, font size, viewer window size, etc. would affect how the book was displayed so you would not be able to experience what I experience?
But I can say the text is covered by the controls every time a paragraph in the bottom right corner of the viewer is selected.
Showing the controls when a single key was pressed would be a very elegant solution IMHO and would ensure the controls never covered selected text.
Here's another picture.
