I have finished a POC djvu support yesterday. It has all the features that pdfreader has, except for TOC, zoom fit to content and rotation.
I might be quite busy in the following weeks so I cannot spend too much time on code clean ups. Therefore I post my branch here, hoping that some body can keep working on this feature:
https://github.com/hwhw/kindlepdfviewer/tree/djvu
TOC and rotation are supported by djvulibre library, so can be added with little effort.
EDIT:
the branch has been merged into master :-)