OK, here's the simple way and it doesn't need a video to explain it....
Add a model to your PRJ called Scaler.
Turn on Snap to Grid and add one bone to Scaler that originates at 0,0,0 where the model bone originates and points in the exact same direction.
Call that bone "CameraBone"
Drop "Scaler" into your Syntheyes chor.
Position it anywhere you want to be the center of expansion.
In the Chor, constrain "CameraBone" to your Camera with Translate To and Orient Like constraints to (with Compensate mode OFF each time).
on the "Scaler" model in the PWS>Chor and choose "Bake All Actions". Set the reduction level to 0
A:M will key the "CameraBone" to match the Camera motion and delete the two constraints on it.
In the Chor, constrain the Camera to "CameraBone" with Translate To and Orient Like constraints, with Compensate mode OFF each time. (this is the reverse of what you did above)
In the Chor, Add a Translate To constraint to every "TrackerX" null you deem important (with Compensate mode ON each time) to constrain it to the "Scaler" model. (not to the "CameraBone" bone, constrain to the model bone)
Hide all the other Tracker nulls.
Select the "Scaler" model, scale it with the corner manipulator. The camera motion and the nulls will scale in exact proportion.
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