Most of the other RGB led implementations use a Remote for controls, so i am not sure if you can find alternative to that.
Altho remote isn't that bad is it ?
Nzxt has a lightning extension kit.
You can check this review, summarized: http://www.pcgamer.com/the-best-rgb-led-lighting-kit/
Just to point out, that NZXT Huge+ has limitation of 40leds per channel, have this in mind.
Im not sure, what do you want to light up, your case or your desk ?