Sort Feature rank in Board view within release by Custom Field (from Rally integration) Merged

We list our features on the Product - Feature - Board view

Currently these features are ranked by what AHA allows us to sort by default AHA fields

However we use many custom fields that are not part of AHA (one such field is a numeric field we get from our Rally integration)

See attached screenshot showing the only allowed fields, we want other custom fields available on the Feature

We also like this feature in the Roadmap -> Features reports as well, currently the roadmaps contain features that we cannot sort by custom fields.