Additional automatic status update between Features and Ideas Merged

Currently, an Idea status will automatically update when it's promoted to a Feature and when the Feature is released. We would like another automatic update in between these, when the Feature is committed (we have a "Committed" status in our Feature workflow).

It doesn't have to be a completely customizable step, but there's a natural feedback point where you want to tell an idea submitter that the Feature has gone from "We want to do it but have no idea when" to "We've committed this for release." We'd love the option to automate this, rather than having to manually update the Idea status (if we remember to do it).