What you need for learning how to auto-generate EMH difficulties can be found here: http://customscreato...tomation-tools/. The instructions and tutorials are pretty solid in giving instructions but if you have specific questions please feel free to ask.
If you take a CON file and import it into the C3 tools or Magma you can pull the project information like the audio and MIDI which you can then throw into Reaper and add difficulties using CAT.
Here's a couple of productive ways to go about this:
1. Don't insult the authors. It takes a lot of time and effort to make a custom and reducing difficulties properly isn't a five minute process. They spend a lot of effort into their work and considering you've been here over 5 years having not posted a single complete custom to the database I'd say you don't really have room to criticize.
2. If you see a custom that doesn't have EMH difficulties, ask the author if you can add those for them, most will be happy for the opportunity to upgrade their customs and will send over the project files for you to add and send back for them to update.
I also see that you've already made a thread with the exact same ask (http://customscreato...wer-difficulty/) so here's your answer to both these threads.