I recently bought an mpk mini and I have managed to set up a remote script so that it works as a 'blue hand' controller. I really like this functionality and it works really well mapping the pads to the drum rack.
However I want to be able to assign the macros or midi knobs so that they will affect parameters only on the pad i have selected. For example it would be great if I could have a transpose macro but that only affected the current pad selected, so i could go through my pad samples and transpose each one separately but using only one macro space. This way just the macros and the drumrack could have a lot of the functionality of more expensive systems like the native instruments Maschine.
If this isnt possible it would be a great feature to include in the next version allowing even the simplest of midi controllers to become quite powerful in conjunction with Live.