Regen also means cruise control works as it should, so no speeding tickets when you are going down a steep hill (and where the police aways seem to sit)
In my 2016 Subaru BRZ (manual transmission), cruise control would never apply brakes, so if the hill was steep enough that engine breaking was slowing the car, then it could potentially exceed the cruise speed. But it would need a nearly 10% grade to do that in 6th gear at 60 mph.