Classes of objects
This request makes sense together my scripting request.
I propose a new advanced property for objects: Class. It would be used to store the role or type of an object in the context of a kit of macros and tools. E. g. in a mechanics simulation toolkit would differentiate different object types such as mass points, springs etc.
There could be a command which would give a list of all the objects of a given class which is supposed to be nicer and more efficient than running a for loop on all objects and check their class field.