I dislike forum apps, either generic plugins like tapatalk or custom ones for the specific forum
Both methods lose many features of the forum and I don't see any advantage over using a browser
(See here for more detail:
http://p8ntballer-forums.com/threads/p8ntballer-app.165604/)
Equally I hate 'optimise for mobile' on websites. This just cuts down the website and stops it working as the site was designed. The web capabilities of mobile phones devices has changed majorly since the early days of Nokia phones on the web, the main reasons were speed and the limits of screens. These days screens can cover the web and bandwidth can cope. If you find yourself away from 3G then an optimized website is also going to struggle
We've spent decades getting phones to cope with the 'real internet' and still people seem to want to restrict it down because we're mobile
On the iPhone just use 'add to home screen' and you have your own 'app'