Draggable with cursorAt in percent

I'd like the "cursorAt" option of draggables to accept positions in percent, much like CSS does. Specifically, I'd like to be able to tell ui.draggable that I want the cursor in the very middle of the elements I drag. I don't think implementing this enhancement would be very difficult (simply checking "typeof" on the value of the property in the settings object).

It would look something like this:

$(something).draggable({ cursorAt: { right: '50%',
                                     left: '50%' }
                       });