rotate the camera (roll) in QueasyCam?

So I've tried the default camera, OCD, PeasyCam, and even tried Proscene, but QueasyCam gives me the best results for my program. However, it does not have the built in ability to rotate (roll) the camera and I'm not sure how to go about giving it that feature.

Does anybody have any ideas?

https://github.com/jrc03c/queasycam

Thank you!

(my appologies to the mods for not putting this Q on the correct board to begin with)