I would like to know if it's possible to sort alphabetically the different metadata when it's shown. I know that the different metadata will appear in the order I write them in the web-client-congif-custom, but is it possible that they appear sorted? If so, how? Thank you very much.
No, it's not possible. They appear in the order from web-client-config, which allows not only to order them, but also put section titles between different types of metadata.
The only way to have them sorted would involve rewriting the property sheet code to implement such function.