Well, I like your plugin. It’s working.
Apart from these thanks I wanted to tell what might be the best way to include the image vote into the imagebrowser.
Add the line <?php echo nggv_imageVoteForm($image->pid); ?>
in the div-Tag
<div class="ngg-imagebrowser-desc">
which is located in the file /wp-content/plugins/nextgen-gallery/view/imagebrowser.php at line 32.
At the end the line should look like this:
<div class="ngg-imagebrowser-desc"><p><?php echo nggv_imageVoteForm($image->pid); ?><?php echo $image->description ?></p></div>
The description could be a good hook to include the imagevote automatically.