Here are my thoughts about the lineal measurement...
Jim’s drawing (very helpful, btw) shows both measurements in use. First (and the method that has been used since the first segment was cut on a table saw), you mark the SEL on the board that is on the angled fence, slide it so that the mark is at the edge of the blade and set the stop at that point. Second, you calculate the lineal measurement from the SEL and cutting angle and use a measuring tool to set the stop that distance from the blade.
Both methods place the stop at the exact same place. One is not more accurate than the other and one is not faster than the other.
Here’s the problem - very few of my thousands of users are looking for a lineal calculation. Fewer yet have any understanding of what it is or how or why to use it. If the Summary suddenly shows up with a new column that makes no sense to them, they will find my phone number or email address which is on every page of the website and expect an explanation of what it is, how it works and why they should use it in the first place.
Yes, I could make a video tutorial that explains it all but users would have to make the effort to follow a link and watch the tutorial or contact me instead. That tutorial would also need to address where to get a suitable measuring device or how to build your own - each of which would spur additional requests for support. I would consider doing this if it was a better mouse trap or could make a noticeable difference in the practice or enjoyment of segmenting but that is simply not the case.
Thankfully, adding the formula using Excel is trivial so those that want to use this method have an easy way getting it. The Cutting Summary that already has too many columns will stay as it is.