Have you ever thought of having a software feature where the TB3 could track stars like a merlin head? Not sure if it would be too tough for a user to calibrate each time - or if it's even possible - but it would be a really useful feature.
Response from eMotimo - you can hack this now by pointing the Pan Axis (pan shaft at the North Star) and choosing start and end points on your horizons with know duration. Alternatively you could set a full 360 move for 24 hours. Start point is your start point.
For intervals, choose 5 minutes with a static time of 4:58 seconds (max).
Programming the tracking speed is pretty easy to do so we might make a mode for this too for the photo buffs.