Well, the answer is not exactly staring you right in the face, but it is certainly there...
From the AVStoDVD help file (clip preview):
Quote:
Set Trim Start (available only if Clip Preview Window is accessed from Edit Title Window)
Shortcut: CTRL+A
Set Trim End (available only if Clip Preview Window is accessed from Edit Title Window)
Shortcut: CTRL+Z
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Load your clip, go to the "Edit Title -> AVISynth" window, uncheck "Auto AVISynth Script" and click the "Preview Title Output" button in the lower left corner. Select your start and end frames, close the preview, and voilą, the script now contains the corresponding trim command.
Cheers
manolito