Ability to assign Full Left Pan and Full Right Pan to the Joystick
This would give me the most important feature I lost from the 56! I have a couple scratches I made up that use the pan fader!

Ability to assign Flex FX toggle to the footswitch
This way you could set up an effect on the Aux bus, and then use buttons 1 and 2 on the footswitch to apply the effect to either channel while keeping you hands free!

Ability to assign 'Effect On' to user groups 1 and 2 and the footswitch
So we can apply the effect while scratching! This is a huge oversight that alot of people say they really want! Adding it the group 1 and 2 would allow us to keep the features we use most on those groups so that you don't have to switch groups as much.

Ability to assign loop edit point to the joystick in user groups 1 and 2
This is so that I can keep the knobs as libray controls, but still fine edit loop in and loop out points in the same group.

Ability to assign the effect BPM lock to the master bus
This way you don't have to send the 'hot' deck to the bpm lock every time so the delay works correctly. When you mix, you usually stay at pretty consistant a bpm for several songs.

Ability to assign a button to toggle through multiple pre-defined footswitch groups, so you can assign and acess more footswitch controls without changing groups.
What can I say I am a footswitch whore, I just cant get enough, but then again what creative tabalist wouldn't be? Think about the way the joystick in the record group cycles the record input.