Just started reviewing H5P. Nice tool! I can see how this could be useful.
I am approaching H5P from the educator's/end user's perspective.
I am using a simple project to try H5P. In short, I am creating material to help my college learners with APA style formatting for manuscripts. In doing so, I found that there is a missing formatting element--at least on the Multiple Choice questions. See http://www.tech-wise.services/?page_id=402 for what I am beginning to do.