oh i misunderstood.
if you bring farr back up and type fc again, you should see your previous history tape and the last value will still be there so that you can use it.
but you mean you want it so that if you bring up farr again, you are already open to the "fc" text and the calculator is showing?
one workaround for now is to create a special hotkey in farr that opens and starts the text saying "fc "
so now whenever you want to use farr calculator you hit shift+break or whatever, and farr will pop up ready to do calculations.