Well, you can't recall several tracks at the same time, if I'm not mistaken, e.g. to start several tracks of the beat (but not the whole pattern) again after a break.
Plus it would give the ability to alternate on-the-fly between selective tracks from the four memorised patterns while keeping, say, an atmospheric pad in the background.
This would be an asset for live improvised performance.
But it was not a request, just a wish, in case it's not difficult to implement and you consider releasing another update one day