we already have tag synonyms, what about having also "single-directional synonyms"?
For example: We have tags like C# or WPF. Both of these subjects are inevitably related to .net and should be tagged as such. But many people don't respect this and often tag C# related question only with C#, or WPF related questions only with WPF.
It would be nice if for example 30k+ users could define an "implied tag", which would e.g. mean that the .net tag is added automatically when someone tags a question as C#.
Why would this be helpful? I would for example like to have all the .net related questions pop up in my Google Reader (RSS). If I added all the .net related tags, I would receive many questions two (or more) times. (I don't want them via email, I like the Google Reader interface much more suitable for this). But if I subscribed to .net only, I would miss many interesting questions.
If you don't like my example with .net, there are more:
- XAML => WPF
- .NET-4.0, .NET-3.5 => .NET
- J2EE => Java
- STL => C++
Also, this would be only a tool to reduce the retagging load, as are tag synonyms.