Idea : Instead of adding every single entity of a tree one by one and for each layout. Add the possibility to reference a tree instead and display pertinent* entities of the tree.
Then when you've added a two new entities to your customer hierarchy for instance, you aren't forced to reopen the 54 layout and add.
* With "Allow user view" checked and if possible in correlation with the cube hierarchical level in the layout.
Bonus :
- In the layout editor, allow to Drag & Drop multiples entities from the left list to the Quick Layout