I think there are also other and probably even financial reasons why this list isn't public. This list completely public may cause wrong expectations as there is absolutely no guearantee that anything on that list will be implemented. And even when PaloAlto decides to implement a feature from that list - the first time this information becomes public is when a new PAN-OS is released. So even when you created a feature request you won't be notified when the decision is made for the implementation. And the financial reason might be something that it could prevent new deals because customers see that list, pick some IDs and then decides to wait for buying that product until this feature is included.
Yes, personally it would be cool to see that list but not really more. And from a conpany view I am sure this list will never be public.
With this post I simply tried to summarize the information that already made it to the public.