I am afraid that it is not possible. I will have a look and check if there is a roundabout way of doing it, but it's unlikely.
You may want to post it in BF3 section by the way, there are better odds that someone will be able to help.
Ran a couple of tests and the only thing that seemed to help a bit was reducing the game resolution... but I doubt that you'll want it, as it makes the game ugly and the change is minimal (~1mm between 1366x760 and 1280x700), especially if you have a 1366x760 monitor (or sth with similar ratio), as then 1280x700 is the only lower resolution that works without messing the screen up. Sorry that I couldn't find more.
