I had the idea to try to write a plugin that updates the ISS orbit data for Stellarium. So I just had a look at the modules and classes used in Stellarium and am not sure if it makes sense to do so.
It's because if the app starts, the plugin gets loaded and updates the data ( i.e. writes the new to ssystem.ini), how can the plugin inform the app to reload at least that section in order to use the new data? If it's not possible the new data isn't used before the next app launch.