Add setting to choose what fields to export through api_fields wagtail feature #205

Hi guys,
I need to build an API REST for a puput project.
My first attemp to achieve this was to extend the EntryPage model through EntryAbstract. But I realized that I just need to add api_fields to EntryPage model to make it work.
So,I think that it would be nice to have a setting (like a list for example) to choose what fields in EntryPage model to export through API feature of wagtail.
Btw, now I'm also want to control the serializer.
So, what do you think? Is there a better way to achieve this?