Provide an overview rule next to the scrollbar of editors

Being spoiled from using Eclipse over the last years there's a feature that I miss a lot in QtCreator: the overview ruler.

To get an idea of what it is, please check this short blog and the two screenshots:
http://dandar3.blogspot.de/2011/03/how-to-change-marked-occurrences-colour.html
http://lh6.ggpht.com/_RyhrdnlxJ-4/TXj1pkr7xJI/AAAAAAAAI2M/I_HmH4Ift5Y/s1600-h/eclipse_mark_occurrences%5B6%5D.png

As you can see, the overview rule provides a scrollbar like summary of certain marks in the open editor. You don't need to implement all of Eclipse's different marks, but heres a list of the bare minimum I'd like to have:

• for each mark it should be possible to configure a color as well as how that color should be applied to the occurance.
• how the color should be applyable: Highlighted, Boxed, and Underlined
• Most important types of marks:
  • "occurances" of a variable in the file
  • "read occurances" of a variable in the file
  • "write occurances" of a variable in the file
• clicking a mark in the overview rule should jump to the occurance in the editor

You would do many coders a huge favor with a feature like that!