Zend certified PHP/Magento developer

Qemu zoom to fit shortcut or cli switch?

I’m using qemu regularly and I find myself in the need to toggle or switch “Zoom to fit” on and off. From the menu bar, under the option “View” we got all kinds of options, like “full screen”, “Zoom in” and “Zoom out.
And among these options is the option “Zoom to fit”

Most of these options have written down keyboard shortcuts, but not the one I need or hoped for.

Next I wanted to find a command line argument for qemu to maybe switch this “zoom to fit” option on, before I even start my virtual machine. But also this is lacking from all documentation I can find on qemu.

So basicly my question is: Is there a shortcut, command line option to toggle “zoom to fit” on or off? Or should I ask the developers or try myself to “enhance” qemu?