I've got a few, though one is for the MIDI driver:
If you can provide an installable multi-client USB MIDI driver (for Windows, presumably for Mac too), me love you long time, Arturia! For example, if I load up Ableton Live, then start Reason as a Rewire slave...right now, I can't use the Keylab in Reason because Live is using the MIDI driver.
On my previous keyboard, an Axiom 61, I was able to use it in both Live and Reason (simultaneously if I wanted!). This would be a huge boost to functionality.
The next rec is for the buttons. I really enjoy the tactile feedback of every button on the keyboard, but they're loud. They produce such loud clicks that they're disruptive when I'm trying to do anything quiet, for example using the transport buttons to listen closely to a mix. Quieter button action would help a ton, in every possible setting.
Also, the pads seem to double-press a lot for me. Not sure if there's a MIDI setting I should be using to prevent that, but I haven't found a fix yet, and it could be due to the pads themselves.
That's all I've got!