For modern stuff, if you had more variations of the same instrument like you have with Drums, like the same guitar going from one strumming/picking/held/muted strum pattern to another.
You now have A part that plays in A and B part the plays in B,
if you were able to F5 change to another pattern of the same guitar having the same tone and recorded level it would blend in seamlessly at pattern changes as a virtual instrument guitar would do.
This will give way more control and variations that will give more creativity to the user.
When the bar to bar regenerate is implemented this will be so easy without having to go into F5, yet F5 will show the changes.

I could create up some UserTracks to show this BUT you can't change UserTracks (or Loops) with F5 and you can't generate up UserTracks (or Loops) on the Util tracks frown cry