How to add additional breakpoints (larger ones) to CSS Media Queries?

I need to add various large resolution media queries for a current project (optimized for large widscreen monitors). I would like to have them work in the UI similar to the default stacking media queries setup with the current 7.3X versions. Is there any documentation on the easiest way to add new ones to this theme framework? I have created a sub-theme and was going to add additional queries in html.tpl.php or a preprocess via template.php, but would rather have them work in the theme settings ui if possible.