Sorry for the confusion, please see my correction above.
You are correct that it will only use that script.sh.erb from the main matlab app, I apologize for any confusion.
You can override the submit and form using the /etc/ood/config/apps as you said, but that script from the main app you are trying to sub-app won’t work.
I hope that makes it more clear, and again I’m very sorry about the confusion.