How can I set 'fit to screen' as the default behaviour when changing my desktop background (wallpaper) Every time I want to set a picture as my desktop background it sets it so big that half of it is gone. I then have to go to the settings and choose desktop then choose a setting. 

It is so annoying to have to go into settings every time I change a wallpaper!

Is there a way to set it so that whenever I right click and scroll to set a wallpaper, that it will automatically make it fit to screen?
Go to system preferences, then "desktop &amp; screen saver", then select the image. You should see a dropdown menu that allows you to "fit to screen."