That is a problem. As a developer u should provide a platform or a possibility to ensure, the modder themselves could easily add their stuff. Have u written an manual for the modders to create their own IRO/Mods packets? It is not your thing to collect all the mods/changes from different threads/sites and then adding them to an existing or not existing IRO File. That is the thing of the modders (normally). U provide just the program! U are Windows or Linux. U don't make pictures, movies, personal data etc!The user does!
The most modders provide their creations as lgp files or as direct files. I like the IRO Files for the structure. U can easily see, which files are for what. Each thing (model) has his own folder. So, if i want to change the Cloud model, i look into the folder with the name "cloud..." and copy these files.
For comparison:
If I download the packets from for example ninostyle i can't say, which file does what. I see only hundreds of files and doesn't know what is for what. A great issue if u are looking for a single character model. That is of course a great deal for the modder, but not for the user.
Maybe you all find a solution for this