How about you can upload a sheet, identify inputs and outputs, then
test the stuff using an input form with these input cells as you
suggested, but then:
- download source code for generated input and output interfaces
(we'd need to implement this),
- download source code for generated calculation engine,
- download .jar with generated calculation engine.
(Since the generated engines still rely on our GPLed runtime, this
could not be used to circumvent the GPL, I think.)
-peo