Giving Matt enhanced senses wasn't the only thing the chemicals did. At some point during (or maybe shortly before) the series, Matt begins to mutate...

+1000 if you use it to give Foggy finding out Matt's Daredevil a freaky twist
+10000 if it's something Matt can use for intimidation, or something that flares up when he's angry (I've been thinking of the scene where Frank sits there on that rooftop basically calling Matt a pussy for his beliefs in particular....)