In addition, have a look in /var/lib/sixad/profiles. There will be a file in there called default, and possibly other(s) with the MAC addresses of your controller(s). If you edit these files with a text editor, you can set the amount of time before the controller powers off. The line you need to add (or change, if it’s already there) is this:

enable_timeout 5

Just replace the number with the number of minutes of inactivity you want before the controller shuts off – I usually use 5.