I'm not sure I understand the case for string constants as event names. Seems
like something else to manage and you still need to choose a static name for
the constant -- what's the net gain? Are you trying to share a library across
envts where the underlying event name will change?
In any case, your problem isn't really Moo, it's JS. You can't use variables
on the left-hand-side of object literals. You can instead use brackets var
oOpts = {}; opts['on'+EVENT_NAME] = ...; and then pass oOpts as your options.
-- S.
