This is more for the sake of the Vita, but a very, very simple way to make your Vita double as a controller and cross-play games would be a smart move.
FORBES: What Sony Should And Shouldn't Do To Win The Next-Gen Console Wars
2.
One way to control this process is to use two beams that, when they cross, double the amount of light in a spot, and thus cause the liquid to solidify faster.