Maybe something like a choke feature in the track view. That plus probabilities on your fill track would be super useful in live play. A nice merger of new and old.
The thing is - you can have as many different Fills or variations as you want already!
Using the different colored launch sets
This is far better than TR8s for sequencing, part of why I didn't buy it.
Music, Visuals, Reviews of Synths, Drum Machines, Apps
Was just thinking a "secondary" song mode that is like abletons session mode, as has been suggested before, to use the matrix as a track launcher, would be great for fast cuts and fills. They could be un quantized or at various notes, quarter eight ect. That along with a "scene capture" feature that grouped the current playing tracks together.