There are many tags that can have multiple uses. This is fine and good. However, it would help in finding questions that I can actually answer if there was a way to join tags for my Interesting Tags and Ignored Tags.
Here is an example to make it clearer:
Tags: Generics and .Net
Tags: Generics and Java
The first one I can help with. The second one I know very little about. I know a bit about Java in general, so I don't want to add that to my ignore list, but I am not much help with a deep Java Generics issue.
This would also help some with categorization. There are tags like [wpf-binding]. That tag is used because databinding can be for WPF or other things. This leads me to tag my WPF Databinding questions with both (wpf-binding and databinding)
Anyway, I am not dying to have this feature, it just hit me as a good idea so I thought I would throw it out there.