I have no experience writing AppleScript, but I suspect this is
possible. I need to script iChat AV to automatically accept incoming
videoconferencing requests, and to automatically clear the dialog
resulting from a remote videoconference disconnect.

Working onsomething very similar, could easily be adapted. Having
trouble with the reset right now, but hopeful.

did you ever get this working?

My app. (AppleScript) works perfectly. Waints on iChat until remote
user signs on and sets status to predetermined value. Then iChat host
sends one-way video invite. remote iChat client then can view video at
@ 15 frames per second full screen. When remote client ends session,
or changes status, host resets by closing chat session and returns to
monitor mode. petty cool.