This hasn't been prioritized yet, but this is something that we think really should happen. In order for it to really happen it needs to be moved into a tangible milestone. So putting it here means it's probably longer timescale than the existing milestones. As it isn't a more immediate priority, or we don't have the bandwidth to handle it, but we do think it's important to do at least long term. In many cases it's something we'd like to do NOW, but know it's not important enough to do immediately in order to get the true near term priorities done.

In Scrum Agile Software Development Methodology (SDM) terminology this is something in the "Backlog".