As others have said, finally someone gets it.
The developer has been very helpful and responsive to suggestions. I've adopted this into my writing workflow very easily. A lawyer friend uses it for litigation to keep track of case elements.
The one suggestion I've already passed on is flexibility in time-unit labels. For example, in writing stories often aren't proportionately linear. There may be a one-week spurt of narrative, followed by the next bit of narrative taking place months or years later. With screenplays, one is more interested in page count and page number than exact chronological distinctions.
I think this product would easily double its sales if one could remove the tethering to chronological time and restate the time units as, say, page numbers. In other words, instead of Day 1 to Day 120, have the option to label as [unit choice] 1 to [unit choice] 120.