For the purposes of our internal rosdistro and associated release process, the developed/maintained status values are not meaningful, and we'd prefer to use other keywords here. For example, development, testing, blocked, ready, etc.
Obviously they're fixed in the source in response to them being defined in the REP, but I wonder if you'd consider a patch which allows a field in the index.yaml (or maybe distribution.yaml) to override the list of acceptable statuses?