No unfortunately we couldn't find a way make multiple rows in a horizontal grid scroll at the same time.
We ended up replacing it with a vertical-scrolling rowList (where multiple columns do scroll at the same time).
Thanks for the reply. Indeed, it is a little unpleaseant that the transition (with jumptoitem) is so hard and can not really be parallel. It is possible to add the transition using animatetoitem but there are two problems. The first remaining that it is not done in parallel (or at least I haven't been able to do so), and if you change the item to one before the selected, it will go forward until it gets back to it (Will make the full cycle to get to it).
Did you sync the movement with its index? Are they in synchrony?