What inspired this wish list request?
A few of us have been pitching work-arounds for this here: https://community.jmp.com/t5/Discussions/multivariate-data-with-a-repeated-measures-design/m-p/63267....
I wonder if this implementation is not as daunting as it would seem. Could features of the mixed-model platform, namely specifying the repeated subject, be incorporated into the partial least squares platform?
What is the improvement you would like to see?
Why is this idea important?