Hi Bruce,
For this, you should use the scripting tools that DCAF provides to rescript the module interface.
First, make the changes to the typedef cluster to add the IO you need, then launch the scripting utility (Tools>>DCAF>>Launch Static Module Scripting Utility) and point it to the appropriate files. This will re-script the clusters and data paths to include your new channels.
Cheers,
Matt Pollock
National Instruments