Customize autogenerated metabox for relationships

[Giacomo92]

Hy everyone,
is there a way to customize the html of the relationships for the backend side?

I have to add more children's field in order to edit it directly from father view. I also have to add the drag feature so i can handle the print order of the custom post's children.

This is a screen from Band Edit View (I use the same example of the site tutorial)

In a few words, I have to recreate all the functionality of the existing "Text List" field type.

Thank you for your help