@VectorStyler
which is the actual repeater feature that this should be in, is it the "Geometry Adjustments"?
yes
does this mean that for example 4 adjustments take values from 4 different regions?
Yes, in most cases they are in different regions, but there are also overlapping parts. For these overlapping areas, it would be best if the effects could stack together, just like they do with many Shape Effects.
some example cases on how would this work
It's similar to a morphing effect, much like what's described here (https://www.researchgate.net/figure/Showing-the-conventional-2D-display-subpixels-behind-a-slanted-lenticular-lens-sheet_fig2_341806198). The main difference is that I use laser equipment to engrave the graphics directly onto the material, but the underlying principle is very similar to synthesizing composite images for a lenticular lens sheet.