edit the file /usr/bin/inputconfig.py
add the lines
self.store.append(["side ok",131,True])
self.store.append(["side cancel",132,True])
and
self.store1.append(["side ok",131,True])
self.store1.append(["side cancel",132,True])
And run the input setup app might be enough to see you wish come true.
Untested....