If I don't have a release set up for an Idea I want to promote to a Feature, I have to go and create one in "full" aha, then go back to the Idea Portal and complete the promotion. I would like to be able to create the new release in the same modal window that appears when Promoting an Idea to a Feature.
As described, when promoting an idea to a feature, it can only be promoted to an existing release. Note that this includes releases which are both scheduled as well as those in the parking lot.
At this time, we do not currently have plans to make changes in this area, based on current priorities and the available workarounds. We hope you can understand.