I totally agree with you.
Instead of using a calculator to apply your scope correction factor to the solution, consider this:
It's a simple graph you can print out, laminate, and keep with the whiz wheel. The way it works is, you do your 'tall target test' to determine the actual reticle movement for a certain adjustment range, and you place a point on the graph. Then draw a line from the origin (lower left corner) to and thru your point using a straight-edge. In order to know how much 'actual reticle movement' you're getting for a given adjustment of your scope, just refer to the line that you drew.
This card would be handy to have for your scope, even for use with other programs that don't allow a scope correction factor (not just the whiz wheel).
It may someday be an option for a customer to specify his scope correction factor when having a custom wheel printed, but that is currently not possible.