I was recently exchanging emails with a customer who had just purchased a V4.1 Firewall Builder license. He didn't like the behavior where the GUI showed the interface name in the object tree and showed the interface label in the Policy rule.
He asked if we could fix this, and so we changed the behavior for our upcoming V4.2 release. Now the GUI shows both the interface name and label in the object tree. This makes it easier to quickly scan the object tree and know what interfaces you want to use in a rule.
OLD OBJECT TREE VIEW
NEW OBJECT TREE VIEW
The moral of the story is, if there is something that you would like to see us add or change in Firewall Builder just let us know. If it's easy you might be surprised how quickly it could appear in a new version.