Force Field constraint v Material Physics

Hi all

I make good use of the material physics (especially the friction setting) but I have come across a bug which is a bit of a show-stopper, and I was looking at constraints/force field.

Now, in 2.56 or 2.57, does this actuator have a friction setting (as I cant find one), and if not, is there any way to approximate friction when using this?

As always, cheers for looking and replies!