for some versions I've been applying this hack myself. But maybe it's time to submit a feature request :)
On that "manage pages" page in the wp dashboard.
I like to see what order the pages are in since i don't just number them 1 2 3 4 5 etc. I have a bit of a ordering system. It's very tiresome to have to check each page every time to see what number they have. So i have hacked the wp files and added the number in front of the title on the page list.
10, page 2
- 1, subpage of page 2
- 5, subpage 2 of page 2
20, page 3
and so on...
Perhaps it's useful to include this...