So, if I'm reading this right you'd have say 4 video tracks:
Track 1: Empty
Track 2: Text Media
Track 3: Whatever generated media you wanted to move along with the TextTrack 4: Your video
Track 2 and 3 would be Children of Track 1. You'd use the "Parent Motion" window (little icon just under the minimize/maximize track icons) to set the motion of Track 1 (which would end up moving Tracks 1-3). That way your text and other media would move but your footage wouldn't, allowing you to track across the footage without affecting it.
Correct? This is the first I've tried to mess with Parent/Child stuff. Seems really nice if you have multiple bits of media you wanted to move together!