These two are rather observations then anything else
1) History. If you by mistake pressed buttons 1-0 while reading the book, then you history to get back to the page you were reading before.
2) "Press Ahead". Reader queues all the buttons you've pressed. So if you remember what keys to press, and in what sequence, just do it, don't wait until screen gets refreshed. Reader will get there. E.g. I'm in book list, book under number 7. So I would press 7 and 1, to "Open" the book and "Continue" to read it.