Not sure if the SLK behaves like the SL, but the car is smart enough to know what events are occuring at that speed.
For example, slowing down to 3mph from driving speed? No way! It requires you to stop first...then it will allow top operation at stop or proceeding very slowly.
Can do in reverse too...
2009 ML350 (84K) - Family vehicle
2001 CLK430 Cabriolet (71K) - Wife's car
2005 BMW 645CI (124K) - My daily driver
2012 Mustang V6 (60K) - Daughter's car