miamiman,
Unfortunately, no, we never implemented what we had planned to. We started looking into it and scoping it out so that certain events could post to a user's wall. However, Facebook then introduced the whole new Open Graph stuff where you can have actions on the user's timeline (ex. "Bob added a comment to Miamiman's website"). We're now re-evaluating how to take advantage of this new system, which is exactly what you're looking for.
The new Open Graph system takes -a lot- of setup and configuration to work right, though, so it's something that won't be available for a little bit. We hope to have some initial support in the 4.3 release (in summer) or the 4.4 release a few months after that. It all depends on how Facebook changes things (to hopefully make configuration easier) and how many complications we run into during implementation.
Hope that explains,
Alex