This is a convenience but how about doing something similar to the water calculator with the yeast calculator? When I go out and calculate a starter, it would be nice to bring the information back into the recipe (currently I capture it in the notes). Bring, say, cell count, pitch rate, starter volume, DME required back into the "Yeast" section. Or calculate there - it isn't that involved of a calculation - but only if someone checks the starter box. As I said, it's a nice to have.