As far as I remember the offset is manual only on the B52.
The C5 Galaxy has a similar system which can be tied into the Doppler drift system. A great idea, but I believe it was deactivated after a couple of Doppler drift runaways in the flare leading to a large number of tyre changes at the same time!!!
I'm sure there is someone out there who can confirm or modify this information as it is from some time ago!!!