1 - ability to apply to a URL path in addition to a domain (i.e. different rules for
www.site.com and
www.site.com/email)
2 - option to load or not load plug-ins (like now with images)
3 - spell-check in form fields on site-by-site basis rather than globally on or off (some sites I post code fragments, so it's a pain, but then others like here I could use it, being a bad typist)