Rather than accounts it should support cloud saves.
The game "Battleheart: Legacy" has had the best cloud save setup so far in any game I have played, imo. The game saves are stored locally on your device so you can play offline, but you have the option to upload a copy of your save game to the cloud (when you have an internet connection), and then you can hop on another device and you have the option to download it.
So here's how a scenario would play out... You play for a while on your iPhone, while riding in the car, making a bunch of progress, then when you get home you decide you wanna play on your iPad, so you go to the main menu, upload your save from the phone to the cloud with a quick tap of a button, then open up JJX on the iPad and then download the saves and pick up exactly where you left off and vice-versa.
So many games today support multi-device saves, I REALLY with JJX was one of them. Using iExplorer all the time to swap saves from device to device really sucks...
