@bastianallgeier:
What about displaying the template filename in the Panel Dashboard, e.g. in the left sidebar at “Page settings”, for easy reference?
[Edit:]
If the blueprints filename differs from the template filename (" !$page->hasTemplate() "), it should also be displayed.
[:Edit]
+1 Yes, I like this too. As admin I like knowing more about each thing. If possible at a glance. I think the Panel’s layout and structure could capably support higher density of information.