Quoted:
Color me extremely interested in an actual app, not a mobile web page (no matter how functional or aesthetically pleasing).
Notification of PMs when the app is closed, but no notification for updates to sub'd threads are two key features, along with a host of others seen in Tapatalk.
I'm willing to pay for an Android app. :D Particularly if you need to pay someone to secure the external board API and/or write the app. :D
Replying rather than Editing so that I can subscribe to this thread.
One feature Tapatalk does NOT have that I'd like to see is the ability to Favorite certain fora or sub-fora. This is a huge board and attempting to find a particular forum whilst weeding through the various Chawin' T'backy and other unwanted fora is daunting on a small screen. I almost never hit XDA Developers on my mobiles (even on a 10" screen) for this reason.