How do I make djvu files to be considered documents in tracker?

I have some documents in djvu format. The tracker search tool considers djvu files images so it displays them with images and not documents. Is there a way to make all djvu files appear under documents and not images?

I also have another minor question. The tracker search tool interface is split in several parts. Below the search bar there is a list of the categories on the left and the search results on the right. It always splits the two roughly in the middle. Could I change the default behavior? I like using the interface maximized (which is convenient when searching for documents), but then I have to resize the categories pane every time to give more space for the search results.

On the same thread, when I search for documents the thrid column of the search results displays an excerpt. When the search results pane is small, this makes the individual rows take immense heights (sometimes reaching 500px). When I resize the page, there is no longer a need for such tall columns but the height is not changed. I have to redo the search to make the row heights appropriate. I believe the search interface can be improved greatly is some of those problems are fixed.