Maybe I took a blow to the head but, I could have sworn that I could dimension sketches in the last release.
Okay, so if I just make a rectangle and extrude it to some height, I can then dimension it. Its a little bit different in thinking but, I can manage. If that's the way its always been then, my apologies for sounding a false alarm.
You can select sketch objects and they will auto-dimension. If you hold shift and select more than one you can dimension between sketch objects.