No MDM for me on the track.
I do understand that some tracks (e.g., the Glen, ...) have very narrow escapes along the track so in these cases it might make sense but my take is: if I can't remove DSC on a track then when would I be able to learn the limits of the car (and mine)???
At Lime Rock I ran with DSC off and I will do the same at Lightning in October. Insurances are made for this I guess...
Again, this is just my personal preference and I am not suggesting that someone is right or wrong to do otherwise.