Feature request: Option to make closing the window do "Exit and stop the service".

[HubKing]

I only occasionally need to transfer files between devices, so I do not want to keep the service running all the time. Waiting for any incoming communication might not be good for security, even if the risk is small, so I would avoid it if I have no reason to take the risk.

Currently, closing the window only closes the window and keeps the service running, and I have to click File -> Exit and stop the service to really quit it. How about adding an option to make that happen when I close the window?