I would say yes and no
as the properties are exposed (you can adjust them with the properties palette) you must be able to drive the block.
It is also possible to use a program (LISP or VB) to drive the block. I know this is possible as I have used VBA to set a few parameters. From this it isn't far from getting VBA to open an excel sheet and get al the required data from there.
However, how you do this simply is a mystery to me.