Single gesture for 100% view

Is there a way to toggle between 100% and fit with either a single or reduced set of keys or mouse clicks?
https://forum.blackmagicdesign.com/
https://forum.blackmagicdesign.com/viewtopic.php?f=21&t=78069
James Spatz wrote:I mean in a regular player window, especially in the color page. For example, quickly going to 100% to check the edges on a key and then going right back to fit to evaluate the whole frame.