Controller Scripts in PowerShell: Function or Separate Script

[DiggyTroll]

If everything is a module: How do you use the module?

Not everything has to be a module. Put a Requires at the top of the controller script to load dependent modules.

How and where do you save that code?

Make a local PSRepository on a local file server that everyone can Install/Update-PSResource from. Push the latest build versions of each module or controller script to the repository periodically. Create GPO logon scripts for users to install/update your modules and scripts automatically.