unpredictable one! This is what it did; if two or more Constraints are of the same type, it accumulates the Target positions/rotations for the constraints, averages them, and then only applies the last Constraint in the row. It seems to be a trick to blend IK Constraints or so... in all other cases I cannot find a good use for it (nor did Bassam). For example; add three Empties, and make one Empty to have 2 location constraints to the other two. This just didn't work, unless you insert an "Empty" constraint inbetween. I will post in the blender.org animation forum feedback for it too. :) Its quite easy to make it an option, but I first like to grasp fully what the actual use of such an option is.