New Post: CreateWebApp() defining paths

I've seen examples of users modifying the CreateWebApp() function to allow for defining the path where the IIS Web App gets saved. Will you eventually add this to the default code?

Can you explain AutoSPInstallerFunctionsCustom.ps1 a bit better? I see where it says:

CUSTOM FUNCTIONS - Put your new or overriding functions here

Can I simply copy the CreateWebApp function from AutoSPInstallerFunctions.ps1 to this custom file, make modifications (for the path field) and it will be used instead of the version in AutoSPInstallerFunctions.ps1?