Mapping back button to 'next page' function in reader

Is it possible to assign 'next page' to the back button within the reader? (It's not in the options menu but perhaps editing a settings file could do the trick.)

Many Android-based e-readers have the back button as the only physical key besides the power button (e.g., Tolino Epos, Onyx devices), so using it to flip pages while reading could be a welcome feature for some users.

If it is currently not possible, is this something that could be added in a future release? As KOReader already allows some user-defined functions to the back button, adding the option 'next page' would probably be a small change.

Thank you