Member Rara Avis
It is, indeed, a good idea. And it was one of the major reasons for implementing the Login screen in the new software.
If you'll stop to think about it, for such a feature to work reliably the system needs to be able to "recognize" you even before you post. The old software couldn't do that. The Login screen (and the multitude of hooks on every other screen) was put in place the last time I rewrote the software to find out if the system "could" be taught to recognize you everywhere. And, uh, it seems to be doing a pretty good job.
Now, if I could only find the time for another major rewrite…