It would be very nice if we have the ability to create some intelligence / parametric functions in our custom panel objects.
Lets say I build a special doorpanel in GDL and add some parameters, and maybe add an userinterface.
I open the doorobject, choose my doorpanel, then the parameters I have use shows up at the bottom of the parameters for the door. And my userinterface shows upp as a new button on the "Door leaf Type" page.
Maybe a hole new way to get objects to connect to each other.
On each 'head' object you open (window, doors), you have the ability to create 'child' objects that you are linking in a special linking tab. Those linked objects derived some parameters from it's motherobjects, but you have the ability to create some parameters that you could set in the linking tab.