It would be nice if a new subclass or sub-subclass could be created by right-clicking on the parent (sub)class in the navigation panel when in hierarchical view
E.g.
Class1
Class1-Subclass1
Class1-Subclass2-subsubclas1
Class1-Subclass2-subsubclas2
If I would right click on Subclass2 and select new class then it would automatically start the new subclass with the proper prefix, i.e. Class1-Subclass2- in this example and then I would only have to complete the subsubclass name instead of either retyping the whole thing or duplicate the subclass and then edit it or edit a subclass, copy the name and then paste it when creating the new sub(sub)class.
Especially when you have to create (sub)subclasses on the go as new information is piling up that does not fit within existing classes and you want to class it this would save quite a bit of time.