Persistent Styles for WPMU
I found this plugin: http://www.siolon.com/2007/persistent-styles-plugin/ which allows you to have a persistent style sheet which could contain special formatting for some plugins formatting, which you want applied to any theme you might choose. This plugin applies a stylesheet which you can edit to any chosen theme, I use the modified plugin from the mu-plugins. I modified it so that the files is created inside /blogs.dir/$blog_id/files/ If you find any errors or problems please notify me and I'll correct them. Keep in mind that you would have to enable the template editor again, you might combine this plugin with another one that helps restrict the usage of the template editor to site admins? Any other ideas?