iFixit manufactured a Torx T6 Security driver for a short period. We could not find any real-world applications for it at the time and discontinued it. Our EU store still has some limited stock
http://eustore.ifixit.com/en/Tools/Drivers-Wrenches/TR6-Torx-Security-Screwdriver.html
Apple has recently started using this fastener in the Mac Mini, and we should have a solution in stock in the USA by 10/24/2014.
[product|IF145-225]