You would think after using Ableton for years now I would've known that... 
Maybe I'm missing something somewhere but most of what I'm finding with my google fu is tuts on how to make one-knob effects and just map things to macros in general. I'm curious as to whether I can actually transfer all the mappings from one knob to another knob within the same group of eight, say if I had a knob already all mapped out with some complex mappings and ranges set, but I decided I wanted to move it to another knob because I decided to add a new macro mapping and have them arranged in a logical work flow.
Specifically, and this is a simple example but it just got me thinking about this as a possible feature - I have a delay time mapping to the first macro and the second macro is mapped to the root note of a resonator. I want to move the root note macro one knob over so I can now map the sync/time selector to the macro knob immediately next to the delay time knob and keep my delay modulation knobs all grouped together. In this case there's not a lot of mapping going on...in fact I've now spend more time trying to find a workaround than it would've taken me to just redo it already lol...
but in more complex cases it would really be a pain to redo everything from scratch.