But you understand that the sender is filling in a contact form to contact you via email without you providing an email. I.e. the purpose of our design is email enquiry.
So the configuration of the sender is presumably to get around SPF. There are better ways to do this. – just make and IP exception for the sending smtp server. Problem solved.
In answer to your query, and being that you are the very first to ask for the ability to configure the sender. – We have no plans to include this development for public release. If you require custom development of the module to include this feature. We could definitely quote you for this. I believe (without looking at details) it would be a reasonably simple mod.