I've honestly had the same idea for awhile.
For some time I've wondered if there was an app for FH, or the forums, that members could use "on the go." Yet, I don't think there is one, sadly.
I can see that it would be a little difficult to make a mobile add-on that coincides with the forums and such, when the mods and admins don't have the time (or resources, I wouldn't think) to create such a thing. After all, they are currently busy working on what looks like a gorgeous map update for us all.
All in all, it would be awesome to see one created either by them, or some FH-loving member to the best of their ability.
That'd be such a cool idea! I wish there was such a thing!
I always resort to using my computer to post on the forums, but it'd be nice to have a simpler alternative.