Make controllers configurable, and with shock capability :)
OK, I was an electronic engineer and teacher for many years. I would teach how I could use an inductor to to create a very high voltage, very low current, to give people a zap that shocked, but couldn't hurt. Especially so when it just goes through two points on same hand, like two fingers or the palm.
It was a wicked blast and class loved to hate it.
SO, I was thinking, wouldn't it be amazing if they had a controller with two metal plates that contact your fingers or fatty part of the palm, and when someone shoots you, you get a slight zap in the hand. HAHA!!!
2nd part is a little less sadistic. Making it so the controller buttons are customizeable. Make the layout symmetrical with the ability to assign the functions they perform to any button you want. As I'm a Lefty, there are times I wish my game system let me put the button where I want them.
What do you think?