I know you can pull the information of 1st through 3rd, even all the way down to 10th if you so chose, but to make it into a formula for TD, I'm not sure that it's possible (even with 3.1.1 as I'm using now). My best best would be to use Excel or Open Office Calc or something of the like to do what you're looking for. To make it easier (if that's the route that you end up going), you can export the stats to CSV and convert that over to the spreadsheet to use. For what you're looking to do, you would want Name, points, 1st, 2nd, & 3rd to be on there. I've got a sample file attached to see how you can go about it (Note that the column headings would be what would be transferred over from the CSV import).
Also of note, if I'm understanding what you're looking to do, if I had 2 1st place finishes, a 2nd place, and 4 3rd place finishes, then my mulitplier would be 10, correct? (That's what I'm basing the formula off of, at least.)