I love this feature because I play a lot of video games, and more in windowed mode. Nowadays, almost every video game publishers include this feature in all of their games. I do not think this work on windowed mode is for nothing...
Allow players to play with their graphics preferences is important. Windowed mode is the same vein as the screen size, resolution, etc.
The idea of 'synchromesh' is good too, to test the game in windowed mode.
Lee, please, thank you to try !