Are such things worth the effort? It would be another thing to plough resources into and fragment the user experience.
Mobile web browsers are also better than ever, and getting better. Bandwidth to said same is also getting better. Are forums like these particularly conducive to the "app" experience as well? Now mobile browsers are actually worth considering for general use then most "app" type setups seem to be more for things you can use in little more than 5 minute spells or read entirely passively.