The current maximum zoom out value is generally quite reasonable for most projects. That being said, I've found myself running up against it reasonably often in cases where I need to maintain a particularly high resolution for source assets, or cases where I'm creating a large, sprawling scene.
Is there any existing way to force a larger zoom-out beyond the built in limit?
One possible solution (in lieu of any kind of Max Zoom value being added to Settings) could be to make it so that the existing fit to screen button is able to override the max zoom to fit everything visible. That doesn't perfectly solve it, since you may have other views obscuring the main viewport and wish to zoom out a bit further, but someone could technically just toss dummy objects into the empty space around the point of interest to force a bigger zoom if that were the case.