If you buy forumrunner they will add a special tab to display your gallery. Once there is a mobile theme then it will show there as well.
My app:
Trackpads for iPhone, iPod touch, and iPad on the iTunes App Store
(Download and install it to see what I mean)
Forumrunner:
Forum Runner - vBulletin / XenForo / myBB / phpBB Forum iPhone App