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I don't have a specific comment on the touchstone issue, but I wanted to mention the Stylish addon. I've been using greasemonkey for years but only just recently noticed it.
It's basically greasemonkey for userContent.css. Yes, it means yet another addon, but on the upside you don't have to constantly restart the browser like you do when testing modifications to userContent.css. It even has a website like greasemonkey's userscripts.org (userstyles.org) where people can put their public code. It also has the same limitation on hostname wildcards that userContent.css does (basically just exact url or url-prefix).
I haven't fully made up my mind on it yet. The script management (monkey icon in Firefox) isn't quite as polished as GM's (and boy did it take a while to get there for GM). And it's pretty easy to add styles using GM_addStyle(), so...
Just thought I'd throw that out there.
Oh, and something quite weird that I'm going to report on Bug Collectors - if you put a url in your post that has "style" anywhere in it, LT changes that word to "forbidden". I'm not sure what this is attempting to avoid but I think it's probably not intended to happen exactly this way. As such, there's no way to link to pages as the userstyles.org page!
It's probably just the HTML parser parsing out style attributes a little too militantly.
Another nice thing about Stylish vs. GreaseMonkey is it's easy to turn the sttyle off and on without having to even reload the page (let alone the browser).