Thanks for your kind words, and glad you’re finding it useful!
DropWord III adjusts the position of the first tab-stop in the paragraph to be flush with the beginning of the second word on the first line – in order to create the “window.”
The position of tab stops is part of a paragraph style. So if a tab stop is moved manually (or by a script), it becomes a style override (marked by a + next to the style name).
So, unfortunately, there is no way to avoid the fact that paragraphs that have a dropword show up in InDesign as having a “local override.”