Master features are now supported in the API. You can view the documentation here.
Thanks for the request. Just to confirm, are you looking for the ability to update a feature with Master feature information?
Or are you looking for the ability to add Master features via the API?
Thanks for the quick response Ron.
Let me know if you need any more information on our needs here.
PS: On one product we have for example, we would like to automate making all existing features into master features (then we will create more features for each master feature as needed), and we don't see this as a bulk update option (you can set the master feature to link, but not migrate [or promote] features into master features) as this work now will require lots of manual work to make this transition without the API to help us out.
You won't be notified about changes to this idea.