The eagle-eyed among you with good memories as well might recall seeing earlier a placeholder labelled "Automatically building the object creation form". It seemed like a good idea at the time (programmers always want to automate things!), but it's gone now.
It would be nice in a production system to automate the object creation menu so that when a new object type is added to the system the form is automatically updated, but it would mean organizing the object classes into a subdirectory, and using some new import mechanisms, and writing some detailed code. Nothing tricky, but too many fussy details to deal with.
Meanwhile we don't have much to change manually in our system when we add a new object type. In fact there are only two places near the top of the file and near each other, where we need to make additions:
Given the ease of the edits it doesn't seem worth the effort to automate this particular task.