I'd find it useful to be able to enter a data point in multiplication format without having to do the sums myself.

I have a goal to finish knitting projects by keeping track of rows. Since how much effort a row of knitting takes varies wildly between projects I have to adjust the road for each project or stage of project. If I could easily input e.g. "8112" or "2723" it would be easy to track stitches knitted instead to keep track of progress.

I think it would generalise to more than just knitting! Repetitive exercises for example.