Normally, this application works, that when the client SW wants to connect to server SW, the server SW checks supported resolutions of the client device, then creates a "virtual display/screen" and then server start capturing the virtual screen and streaming it through network to the client.
Please, I beg you, add a feature, where you can create the virtual screen with custom resolution without needing client SW to connect.
I know that this is not quite what is your application designed to do, but I believe it is not hard to add just this "cropped" functionallity to it. I am requesting especially you, because your application already has everything what is needed.
Hope you understand.