"Configurable" might be a little misleading. It will let you choose between iCade and iCade Mobile mappings that are detailed in this pdf. Unfortunately, configuring the mapping of each button individually on the user's end is not supported at this time.
Out of curiosity, does the 8bitty work properly on the iPhone on TPA? I wasn't able to find any mapping documented for 8bitty in my preliminary searches.The 8bitty does work, its just the button layout that is messed up