Just a few suggestions:
Option to remove the large white circle/time code thing. I use my NXS2 set in conjunction with RBDJ in order to take advantage of Lighting Mode only. I have no need for the timecode circle thing. Would love an option to remove it in order to lower (even slightly) CPU usage and (more importantly) free up screen space.
Similar GUI scrolling waveform layout as Traktor. Though I'm mostly focusing on the waveform of my CDJs, I find the full screen-width parallel waveforms to be a bit much since I'm use to looking at the size of the waveform presented on a CDJ screen. Would love half-sized waveform scrolling, similar to how Traktor has their 2/4 deck setup. It's nice and tidy, would probably reduce the CPU redraw rate as well since there wouldn't be as much lookahead required due to shortened waveform animation length.
Keyboard Shortcut Disable/Lock. I had a bit of an "oops" moment at a recent gig where I thought I was punching in the name of song in the searchbox, but because my "click" of the search box didn't register, I ended up activating a shortcut for a Loop. I would love a way to disable keyboard shortcuts, wherein the keyboard would only act as a pure QWERTY input device with all shortcuts deactivated.