You probably won't get support for this. Even if you do have local support here, you'd need somebody at StackOverflow Inc to push the change and they'd probably have to implement it over all sites.
However you could implement this for yourself using a greasemonkey script. The pages already have jQuery running on them so I imagine it would be pretty simple to:
- Loop over
$('.question-summary') and for each element:
- Pull out the question-ID from the element ID attribute
- Add a link to the box.
- Bind the link's click action to throw a request to one and then add a link that does an AJAX
I'd write you a full script if I had any free time at the moment but hopefully this is enough of a clue for somebody to pump something out in a few minutes. Or you if you've any experience with jQuery... It's really not that hard once you know what you need to do.
Edit: Found some time. Greasemonkey script awaiting you: http://userscripts.org/scripts/show/85630
It can be better. It doesn't show if you have already favourited a question and that means that if you click it again, you un-favourite it.