If you own Bioshock 2, you now own the DLC automatically. Controller support should be added, they were working on a depot with the title controller support for about a month, with the title eventually being changed to approved.
http://www.polygon.com/2013/10/3/4799706/bioshock-2-minervas-den-released-on-steam
http://www.polygon.com/2013/10/3/4799706/bioshock-2-minervas-den-released-on-steam
