I've just tried this new version and here are my comments:
The 'Read' mark in the Book List was unexpected for 3.3 but it looks great and seems to work OK, I'm not sure why you'd want to remove it
I'm afraid I can't help with KitKat and I'm not sure how I'd create a read-only directory in Android 4.3.
I'm glad to see all my Published Dates are Year only, as per calibre prefs. I wonder how many people are interested in day/month details for pubdate?
Re: Book Details page. I don't know whether this behaviour was introduced in this version, or whether I just didn't notice before. If I accidentally tap the screen in white space to the right of one of the hyperlink fields (author, publisher, series etc) then it's as if I actually tapped the hyperlink itself. So, on a phone with almost non-existent side bezels it's quite easy to be whisked off to a subset selection of books by accident. The book I was currently reading the Details of is guaranteed to be one the subset so it wasn't too difficult to get back again, but it may be worse for those with a lot more CC books than I have.