When the host is a single monitor, I can use stretch mode on the viewer and then simply resize the window to zoom out to get a good size of the remote screen on my desktop. When the host is multiple monitors though, and I want to see all the monitors, the stretch mode is really small and I can't zoom in much because it is so wide, it hits both sides of my local monitor... and if I use normal mode, it is way too big and I have to scroll a lot to see everything. I need to be able to control the zoom so I can get somewhere between the 2. I need it bigger than stretch mode, but smaller than normal mode.
In VNC, I could use the + and - keys at the top to quickly and easily zoom to whatever size needed.