Thanks for inquiring your developer about this. I would still think this is worth pursuing:
1- Customers like myself would enjoy the benefits of your client/server architecture.
2- The software could now add another listed feature in the documentation showing that there is not restrictions on how to do client/server (I don't use Domain controllers in order to avoid data centralization - hack me once get it all)
It's too bad that the developer may not do it, but if you say that the new release will have this feature, doesn't that also imply that he has to do it from scratch anyways? This exercise may be even productive towards the next release