Given the low entry cost of xdev and remarkable usefulness over all, the temporary hand entry of values into the whatif function services well. I have been doing it since the function quit being automatic, a tad inconvient, but it still does the job. I am glad to see xdev 98% functional, lets give Myst and Yong an applause and hope that in their spare time the What-if funtion gets up and running properly.
RLF