Should we create a separate forum? where should they be put?
Most people have been either creating a github issue labeled enhancement, or if you want to foster a discussion, just using the Developers category here on talk.manageiq.org. Maybe put [Feature Request] in the title of your talk topic.
Using the Developers/Blueprints tag was correct for your particular request, and it’s the right way to kick off discussion, but in order for the feature request to become real, it eventually needs to be a feature request on github issues. I suggest having the discussion with developers here and then, assuming there is a broad consensus that it’s a good idea, making the formal feature request on github.