Hey Spectronaut -
Unfortunately we have not had much progress as of yet as Mr. Ernst is extraordinarily busy currently and Epic is still using Maya 2014 mostly. That being said I will let him now that this is still a reported issue with Maya 2015. I would also recommend posting this in the ART forums post as we have an active community who may have an answer to this issue, Animation and Rigging Tools: FAQ, Known Issues and Feature Roadmap - Character & Animation - Unreal Engine Forums
You can also keep up with the development of the ART here, DevBlog — Jeremy Ernst
Thank You
Eric Ketchum