Contribute to Commercial Modules

Is it possible to contribute to commercial modules? Specifically EPM? I am assuming no because that would require access to the source code but figured I would ask.

What would you want to contribute?

I would like to add more of the commonly used fields to theYealink templates to remove some of the basefile work required.

Similar to the way you have control over a Sangoma phone.

No the source code is not available or modifiable