One thing I would love to do is change hands, for example, mid-flight. So for example, let me use a marker for the outline, then finish off the scribe colouring with a "brush" hand.
Backgrounds are another place where this could be useful, so if I want to write something - let me change to a "paper" background, and then back to a colour that accentuates the imagery that I am using.
I am sure that a brainstorm could probably suggest a good list of enhancements like this, and I think they would add to the fluidity and impact od scribes.
Thanks for listening.