Read the answer I gave you on the cgiapp mailing list. The issue that you don't seem to be understanding is this: all runmodes are functions. There is nothing magical about them. If you want to change runmodes, you have to change which function returns back to the C::A function that calls runmodes.

Here's another way to think about it - you need to change what value is returned back to the C::A function that calls runmodes. I actually have runmodes that act as traffic cops, figuring out which function actually will generate the output, depending on various conditions. Those output functions are not "runmodes".