“Max” Preussner a Sr. Engine Programmer here with Epic Games stated in this thread in late March 2015 that other high priority tasks has kept him and his team from moving with this support. So, I reached out to 3Dconnexion and implored them work with Epic about getting their products supported in hopes that they can assist Epic with supporting their mice and move it to a higher priority ranking. I used their Contact page (http://www.3dconnexion.com/contact.html) to send a message, perhaps we should all do the same. And I’ll send another message out asking for an update.