Yes, I read that.
My best option would be use the function hookEditItem (since Triggered when any bundle-able item (ca_objects, ca_entities), are opened for editing in Providence). However, I need to know if there is a way to recover the html code for each screens' element to modify it and added more code (for example a button's).
Obviously, this code should be inside hookEditItem function.
Do you have some advice or idea?