Remove the video crop feature.
The video size should be maintained.
If the camera has a wide angle, Skype should show the full size video and not a cropped version.
I don't think a setting will be required, just avoid to crop the video.
It is like buying a book and then cutting it to have the same size of my other books. At the end it will fit but it is unreadable.
Oleg Gorfinkel commented
The "crop/don't crop" option could be made available, but in Settings and OFF by default, rather than requiring users to select it every time when they DON'T want the video cropped.
I suggest everybody consolidates their votes to a single entry. https://skype.uservoice.com/forums/914527-welcome-to-skype-ideas/suggestions/36228178-display-full-width-of-everyone-s-video-feed currently leads in votes.