I think Steinberg should expand on the Chord Track paradigm with a Groove Track that allows for building grooves from GA pattern pads/blocks, while still allowing for automation, etc. It would be great if each block could have characteristics that could be set like ride cymbal, open/closed hats, end with fill, more complex than previous block, etc.)
Triggering the patterns\and quickly auditioning in the context of a playing track from MIDI notes in a MIDI track is a bit cumbersome.
I hope this keeps getting developed. It could really become a killer songwriting tool.