Yes. You can have many WLANs configured. The limitation of 6 is on the AP side itself. There is the confusion. Controller wise the numbers are as has been stated for the WLANs. Just do not put more than 6 on each AP. If you can standardize across your environment, that will hep with making changes in the future. Change one, they all change. You can also use wlan-overrides to customize each location.
Hope this helps to clarify the limit of 6 WLANs - per/AP not controller.