I wonder if you can disable the touchscreen while reading, as it does also have physical page-turn buttons.
Amazon will convert other files formats and send them via email to you as we'll. I've done it with a few PDFs. My nook has shipped, ill have a mess around with it mainly because I'm a sucker for a bargain. If user reviews are anything to go by it may end up replacing my kindle 5 although I'm not convinced by touchscreen ereaders, I like to have my thumb on the screen while lying on my side, with the iPad it's constantly flicking pages.