Improve the Custom Property creation UI

Currently, to set the type of property created, you just write the property, whether it is an integer, string, float, ...etc, and blender figures out the rest. However, most people don't even know most of the possible property types available. And as far as I'm aware, there's no way to create a drop down menu.

I suggest we get a drop down menu with a list of all the possible property types like so:

Or, at the very least, make it possible to create a drop down menu from a list, because currently, all we get is a number that represents the number of items in the list, and no way to access the list from the UI.

I am aware that it's possible to do with python as I am showing here, but not everyone knows python. It would be very helpful for new and veteran users to be able to access all possible property types easily, including hopefully a drop down menu, in order to make more user friendly rigs.