Apr 22 08 UPDATE:
v.3.
Now that the new wonderful REAPER SDK is available, I had to try it out. One thing that has always bugged me about DAWs in general is the reliance on the mouse, so I wrote a plugin that lets you perform common track operations with the keyboard. Now when I'm listening to a 50+ track mix and I think, "hmm, guitar 3 should go down by a bit", I don't have to hunt for the track fader.
It's not too easy to explain, so here's a quick example - Press 'c', box opens, enter a command, say "v*gtr* -1", which turns the volume of all tracks with "gtr" in the title down by 1db. Or, "msnare,6" to toggle mute on the track labeled snare and track #6.
The full instructions and download information are at
http://www.standingwaterstudios.com/reaper. The examples section is probably most helpful in getting you up and running.
Consider this thread the "official" place for ReaConsole bug reports/feature requests.
It's still in it's infancy; you probably won't want to try it out for the first time on some really important project.
Enjoy!
-Tim