In reply to Superpump:
CurlyStevo makes a very sound point about climbing above the krab on a static rope using a static anchor belay, there is an increased risk because there is nothing to absorb the shock of a fall in such circumstances. It's really a balancing act between trying cause the least amount of potential damage and your own safety.
I prefer to use a static rope but if the anchor belay is too long you can feel a bit "exposed" once above the krab.
The important thing in either case is that the belay anchor set up is static.