Originally Posted by crutledge
What I would expect from a Preferences Option.
I don't think I quite understand how this would work, or help.
Delete Unused Stylesheet Classes (renamed for the next beta to be clear its only classes - although technically they are selectors) checks your HTML and stylesheets then deletes the stylesheet entries that weren't matched by a class used in the HTML.
Delete Unused Image Files does something similar - removes any image file that was not included in your HTML with an img tag.
These are actions you run on demand. If they were on or off in a preferences setting, then as soon as you added an image or typed a class it would be deleted before you could use it.