Completion enhancement and highlighting

When navigating only with the keyboard, I found shortcuts very useful. In the case shown by the screenshot, I propose to:
* Change the completion process (If TAB is pressed here, konqueror's address is fulfilled with the first choice) so that TAB completes the address as far as possible by keeping current choices (in this case extend to Task.3_).
* Create shortcuts and highlight them (as done in red in the screenshot) to indicate what to type to have the corresponding address in konqueror's bar

Roughly, this is what is done in emacs22 for completion. I guess it's quite straightforward to implement.

Hope this helps,
Clément