I, too, am looking for a good way to work the controls with this app. I have a Samsung Behold II (reworked to run the Galaxy OS). It doesn't have a hinge-keyboard because I detest them.
However, because I made that decision, I now have a problem when it comes to remapping keyboard keys for both Nesoid and the Frodo64 emulator. I would love to use the circular D-Pad looking thing for some control, but can't remap accordingly.