Linking events in skimage.viewer

I I started to build an interactive image exploration utility based on matplotlib. Recently, following a link on this list, I encountered skimage.viewer, and found that the plugins architecture matches my needs. I could not find how to link keyboard and mouse events (and maybe buttons) to plugins. Any suggestions? I am using version 0.93 on linux (I can install the pre 0.10, if needed) Thanks, Nadav