I have four tags favorited and about eight or nine ignored. For example, gimp is ignored because I don't use it. The problem I'm finding is that if someone posts a question tagged with multiple tags—and one of those tags is something I've ignored—the question gets greyed out even if there are tags I am interested in. For a random example, here's a post tagged with gimp that has nothing to do with Gimp, really: Is it easy to convert an image to a cartoon with high quality?
My feature request would be to allow favorite tags to trump ignored tags, if the user so wished (for example, the fact that the above question was tagged adobe-photoshop would highlight the post in my list, despite the fact it was also tagged gimp).