i absolutely think there is still a great deal of potential for a audio track control that has not been implemented. Right now, in track mode theres nothing to do when you select an audio track. Imagine if the pads allowed for loop brace control of a playing audio track, similar to how the drum racks bottom right quadrant responds. And, of course, if they ever get round to fixing the 'move_playing_position' api call to allow for mlr style resequencing, that would be very good too. Not to mention slice to midi etc. It'll be fun to delve into the python script to implement this (it would be better not to have to involve user mode for control of audio tracks, i see user mode as a means of completely changing the functionality of the device, rather than simply extending it, as i suggest here).
the Macros can be used to adjust loop start/end points among other common used controls depending on what you have setup, ive seen it with my own eyes, i used audio loops i dropped in and was able to macros to what i wanted