The good news is that this works out to only 9-11 minutes per day, so if Proverbs were being read in half-chapter-per-day increments, probably we'd be close to our 15-minute goal.
However, I don't think SS programmatically actually does what I want, since it comes out like this (with 4x reading of Proverbs in 2 years):
The problem is that it cuts up the chapters (e.g., Psalm 2 – most of it is read on Day 2, but a few vv. on Day 3).
Feature request: an option to make the plan not have any cut chapters except for, say, Psalm 119. It could have some algorithm to calculate what the number of minutes per day would have been with cutting up of chapters, then it could tweak to remove chapters from one Scripture Segment and fill out ones that would have been divided between days to get to a reasonably similar amount of reading time per day. In order to smooth things out, I wouldn't even mind if in exceptional cases there was no NT reading or no Proverbs reading, if that was needed to keep the time consistent. Edit: or maybe SS could allow the user to permit dividing chapters also if they are over X number of vv. long (with a dialog box where the user could try different things to see how it comes out). Some long chapters in the Prophets could be cut up without totally losing the chain of thought.
I guess I probably need to manually go through the whole thing,
do a lot of tweaking, and create a manual (custom) plan to import. I'll see now how to import a manual plan.