if I get what you're saying right, the Windows does this work for the PDF Explorer?
No. What I tried to say is that the functionality is not available in the PDF Explorer and in the PDF-ShellTools it is implemented, mainly, by the Windows shell, so it's something I can't use in the PDF Explorer, that is independent of the shell.
But with the PDF-ShellTools you can easily make use of enumerated properties, by
mapping a custom property to an already system defined enumerated property, e.g. the
system.rating one, or you can configure your custom property as enumerated yourself, from the
properties advanced editor.