This has probably been suggested a million times before and maybe you're working on one, but how about a mobile app? Something similar to the mobile web layout you already have but maybe you could make a possibility to add journal entries on-the-go. A friendly suggestion.
The staff have indeed announced a while ago that they will be working on this soon (so they may have started already). in the meantime this is indeed a common suggestion, please see the forum posting guidelines
There is no point to an app that is the same thing as the mobile website itself... That's just a waste of time and resources. The better solution is to improve the current mobile site.