Doc.gdi:
But for go for the last thing I would like to know how to add to the mesh editor the possibility of setting the default values of the struct. I guess is a bit complicated, but if you could please explain it or if you know of a documentation or tutorial that shows how to do it (even if is other editor insted of the static mesh editor) i will be able to complete the task.
You can add Toolbar buttons and menus, or add a details like pane to the editor, you just hook the editors Open and inject your code, Here’s a tutorial on it:
http://wlosok.cz/editor-plugins-in-ue4-3-toolbar-button/
Here’s a link to the Details Panel info: