I build web apps for a living, so I can genuinely appreciate the concern for security. I think the biggest thing here is doing something to make the site more mobile friendly; Tapatalk was just one solution. Right now it's pretty painful to browse, and more specifically, post, from a mobile device.
I haven't work with phpBB in a mobile sense, but if there was a mobile theme (i.e., users still go to beardeddragon.org, they just get served a different theme on a mobile device), would you (or have you) consider something along those lines? If so, I'd be happy to put in the research to find a few to present. Since security's your forte, I assume this board is running phpBB 3+? I haven't looked, but I'd assume there's plenty out there for 3.0 to make the mobile experience more usable for those of us on mobile devices.