does 2007-8 E-class have "auto-hold" transmission? (m)

Seems to be a US legislation issue, it has been in Europe from W211 SBC and the W221 equally as the face lifted W211 without SBC have it.
Had a look at W221 DAS and it appears that the feature is hidden by SCN coding and I would expect it being pretty difficult to have it activated on cars that did not have it active from the factory.

On my W221 the tranny would go to neutral if I operated the parking brake. That would mean a lot of "moving parts", both the hand brake and the tranny. Not sure if that would really cause some harm but certainly different from the hold function.
On the other hand, new VWs with DSG (basically manual tranny with dual clutches that are electronically controlled, is using the electronic parking brake to keep the car stationary at traffic lights (since it does not have a torque converter and cannot slide the clutch that long. Perhaps it would be OK to use the parking brake on other cars too, this frequently.



