I would the ability to run/call a module from within another module. I've thought of two solutions:
Simple - Add an option that currently exists in the Analytic App properties to "On Success - Run Another Analytic App". Instead this option would be to Run Another Module
Complex - Create a new tool that would have a single input that would accept a list of filepaths to Alteryx modules. The modules would be run sequentially (module 2 run once module 1 was finished).
Cheers,
John Hollingsworth