I cant believe you connected a mouse to it.
Have you tried other USB keyboards? If the mouse works, there has to be a loophole to letting keyboards in.
That would be a great addition to when the browser is released (hopefully April
For the DRM, i know @Kris777 made a post about connecting to Overdrive through Adobe DRM at the library, so i think there should be a way to connect to it other than WiFi. He needs to see this post and comment though cuz I've never done it myself.