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In the Preferences dialog, there's a checkbox labeled "Advanced". (edit: The Preferences dialog isn't your standard OK\Cancel\Apply settings dialog. The only way to effect the changes you've made is to press Enter -- it doesn't matter which object in the dialog currently has the control. Pressing Enter will effect the changes and close the Preferences dialog.) When you pull up the Render Zoom Movie dialog, it will now have a textfield labeled "Starting Zoom". Bruce coded that in a way that keeps the math simple. If you're restarting a render from its first interruption, simply copy the zoom level you would see in the Zoom Movie Player when it's paused on the very last frame of the incomplete render into the "Starting Zoom" textfield of the movie render dialog. If it's not the render's first interruption, add the end zoom levels of all the previous incomplete renders and type that sum into the Starting Zoom textfield. You will have to rerender the last frame of the previous movie file, but it wasn't always like this. Awhile ago, an incomplete render will end in a pure black frame that the movie player would then try to zoom in on. The only way to delete the black frame from the final zoom video was to rerender the last 3-4 frames from the incomplete render to cover up the black frame which at high zooms could mean that you just lost 1 or 2 days of work.

This also works for zoom movies whose final magnification isn't an integer. Yes, there are much more complicated things going on here, but Bruce has coded the program around them.