Filtering features in the API

The [API documentation][1] shows some very basic filtering that can be done when retrieving features. I was hoping that there would be more specific filters available. For example, I wish to get features that are for a specific user *and* at a specific workflow step "My features which are in progress". Is there any way to do this other than grabbing all the features for a user and then filtering by workflow step on the client side? [1]: http://developer.axosoft.com/api/features.html#!/features/_item_type_GET_get