Improvements for Menus

[Mckilem]

I'd like to propose some improvements for Menus.

• When adding a set of pages with children, I think it would be useful if the menu structure would also follow the relationship between parent and children elements. Currently, when adding pages and their children, all of them go into first level so children and their children must be rearranged manually.
• If replacing a parent menu item (does not necessarily need to be a parent page), all the children are sent to level below, so they have to be rearranged manually again. I think it would be useful if we could replace any element that has children with another element without losing the structure (something like "replace this menu item")

[welcher]

Thanks for the ticket!

It would be a good start to submit a patch or maybe some screenshots of what you have in mind.