has anyone tried to integrate ?

Instead mcp23017 I want to use mcp23s17 which is used in PiFace, however, is limited to 4 in domoticz, and the raspberry pi can address their 8 and an additional 8 to spi1, which gives 128 + 128 = 256 inputs / outputs. if someone tried to modify PiFace.cpp domoticz to detect them more than 4 Piface?

new ideas ?
I fight with this a few days (