Ok, forever might be an exaggeration. It might be an "advanced" feature, but would save me a lot of headaches. Some of us members, as you are surely aware, send and receive a lot of PM's. When doing so within the app, there is no way of knowing how much space we have left. I've been bombarded at times; not knowing I had run out of available space until I checked my email.
Being able to delete pms from within the app would be great, even if it's restricted to the ipad build. If that isn't possible, just displaying the # of messages stored or % of free space would be nearly as helpful. I could perform these functions from within mobile safari, but I always end up accidentally hitting the "TA App" advertisement.
Besides...I thought we were living in a "post-PC" world