Very restricted possibilities

I am quite dissappointed with this app.

I mean, I like the idea very much and it works reasonably well, once you managed to open a text to read. But
1. You dont recognize the structure of your text. A headline looks exactly the same as normal text and you keep wondering what these half sentences mean, before you realize it was a headline. Also, it would be good, if pictures could be displayed while reading in their vicinity, but it seems that, as soon as you start reading all that is shown are 13 characters.
2. The more serious drawback however is that I cannot read the ebooks i have stored with my kindle app or iBooks or PDFs - at least I did not find a way. How shall I use the app if not for my regular reading material? There seems to be a way to connect with pocket, readability, or instapaper, all of which I neither use nor even know, and it is possible to read from URLs, the latter being the only sensible use I can make of the app.

-Teletubby- about Rapid Reader - with Spritz, v1.11