wordpress admin panel pages menu problem

Hello it's me again.
I need your help again, it is not a GP problem.

Like some of you know i have many pages in the site im building http://www.adlerpneumatyka.pl, curently 240.
You can imagine how my admin panel, submenu "pages" look like, pages are related, parent, child, grandchild and so on so on...

I am still building the company products offer and i am adding new pages every day.

Now the question, do you know any way to make the admin "pages" expand, collapse and so on similar to the menu list <ul> <li> dont have to be mouseover can be clickable on a base of pages parent, child relations.

Any idea if such thing is possible by coding or plugins or anything?
It would ease my job a lot...