Yes, I think a custom mobile app for your website, or just making apps related to your website category which has your website link and branding on it in the About section could increase traffic since there are a lot of people searching for apps on the Android, iOS, Windows, Symbian, and Blackberry App Stores on a daily basis for different category of apps.
Conduit gives you a QR barcode and sub domain website which you can use to promote your App, so I think if you print a bunch of QR codes out on paper, and stick them all over your town like at the park then some people may scan your QR code for your App with their Smartphone or tablet camera to download your app to learn more about your forum.