LR needs a module that will cook us all breakfast in the morning as well. 
Seriously, I can't think of anything else I could want as far as an additional module goes (beyond some of the more sensible things that have already been mentioned). As someone mentioned, it would be nice to be able to create and customize borders and watermarks. I can potentially see that as being its own module. Let's see, we have the Library (importing and browsing), Develop (RAW processing), and then Slide Show, Web and Print. Pretty much this is all we do with digital images. All the extra "fluff" is done in photoshop. I would definitely like to see some features tweaked such as sharpening, noise reduction, and other filters we typically use in photoshop, but for the most part I'm pretty happy with LR as is. And I know there's plenty of room for it to grow and be refined, so that's what makes the app. even more exciting. I like surprises, so let's kick back and see what Adobe or third party companies offer in the way of improving what's already a great product. 