Autozoom to window in focus when presenting screen

Question

When presenting using ultrawide (32:9) screens, usability is not that great:
Sharing the whole screen makes it too small for recipients with standard monitor formats (eg. 16:9) to be able to see details (like text)
Sharing the whole screen causes bad image quality even for recipients with ultrawide screens (32:9) as too many pixels are involved and bandwidth/compression cannot keep up to provide sufficient quality. Details (like text) are hard to see.
Therefore the presenter needs to share specific windows only and has to manually switch to the window he wants to present at the time.
Therefore it would be nice to have an autozoom feature when enabling full screen sharing.
Autozooming to the window on the screen which is in focus probably provides the best usability.
Alternate solution suggestions:
Constans zoom centered around the presenters mouse. 
Disadvantage: Probably neausiating and not good for image quality/compression, as a lot of changes happen on the screen all the time.
Select multiple screens for sharing and the presenter has a more comfortable way to switch between the windows to currently share. 
Disadvantage: Still requires the presenter to remember when to switch the shared window.
Select multiple screens for sharing and the recipient can switch between the windows to focus on. 
Disadvantage: Recipient has to be on top on which window to look at and probably not good for image quality/bandwith, as all selected windows have to be transmitted all the time.