I'd like to add two suggestions; at least the second one
should be very easy to implement.
1. Support for searchable djvu files
2. A simple text editor.
The present editor is almost ok but can be used only for .txt files
provided that the file is moved in the "text editor" folder.
Also, if a text file is identified as having a html content
(using its first 256 bytes) then all the tags are formatted and
thus cannot be edited (without some manipulations).