If you're inputting frame counts, where would they come from? Word wouldn't know anything about them, so I expect some form of user input would be required. As for the alternative of measuring the time in seconds (which Word could do), do you really need millisecond resolution?

In a previous post, you mentioned the need to change font formats. Is this just for the time-stamp, or do you have something more elaborate in mind? I get the impression you may want to change the font for each speaker. In that case, how many speakers would you want to cater for? A court-room scene, for example, might have 6 or more (complainant/prosecutor, their attorney, respondent/defendant, their attorney, witness, judge/magistrate). What kinds of font differentiation are required?

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]