I would love to see a auto panner that will make the recorded audio go from the right to the left speaker automatically, a constant back and forth motion from right to left. It would be nice if this effect could be adjusted to the desired length between pans (millisecond or whatever) . Thanks very much. 
There is a plug-in for this. It’s called “LFO panning” and you can download it from the main Audacity web site here: http://audacityteam.org/download/nyquistplugins
More information about plug-ins and how to install theme here: http://audacityteam.org/download/plugins