I'm sure it's possible, but one way to avoid it -- turn the constant into a method:
> robot.keys.ENTER()
(Not great for key combos, though...) > robot.keys.ENTER()
(Not great for key combos, though...) robot.keys.enter()
(since enter is a function, not a constant) and make it chainable by returning `robot.keys`. robot.keys.ctrl().enter()