Very much agree, this is important!
Please have the client remember the window size/position.
Also, 1:1 is marginally good, but I wish there was also an option which adjusted the window size too, not just zoom in/out, as mentioned above.
Could be named “clone remote dimensions”. So if remote window is 1600×1200, the local window would automatically resize to 1600×1200, and show the remote screen 1:1.