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Re: @jscher2000:
It's no longer a hidden feature. They have a "Install style as userscript" link right on every page just above "Discussion".
I actually just converted all of my UserCSS to UserScripts so that I could only have TamperMonkey installed and not Stylish. Perhaps instead of making a separate UserCSS site, just make a "Convert this CSS to a UserScript" function that allows people to paste in CSS and easily make it into a UserScript.