[foobnix]

Adoby,
>Breaks the focus. Perhaps some form of delay/debounce between the first few taps in a sequence of taps?
I am using default Android tap detector, double tap should not be a problem, maybe something else, like change orientation, or other settings affect on it

>I would like to be able to disable pinch to zoom and drag. Sometimes I move or zoom the display unintentionally. Breaks the focus to fix it.
Is it lock mode (right bottom icon of lock) did not help you?

>Support for automatically grouping/browsing books based on calibre hierarchical genres/tags would have been great!
Could you please send some books (maybe with other meta files) sample with Calibre genres/tags

At this moment app supports Calibre metadata.opf (should be in the same folder as book file)