Feature Request: Combination Zoom Fit and Keep zoom ratio

Hi All - I'm a big fan of FastRawViewer.  I use it almost daily.
Would it be possible to add an option to the Preferences->Interface->Zoom->Common zoom settings -> Image Zoom on Next file that combines the "Fit to window" and "Keep zoom ratio" option into a single option.  
Note:  I have the Zoom In/Zoom Out range set to "Fit window".
This option would work like the following:  If the image is zoomed out - i.e. fitting the window, the next image will load and fit the window.  This would address horizontal vs. vertical aspect ratio images so the fit the screen like the "Fit to window" option.  If the image is zoomed in (not fitting the window) it will work as the "Keep zoom ratio" and maintain the current zoom ratio between images.
Thanks - Joe