The problem is simple and I do not find a solution until now.
When you plug a Cobbler on a Pi then you cannot connect a PiFace ( http://mchobby.be/wiki/index.php?title=PiFace-Manuel ) .
When you connect a PiFace on a Pi then you cannot connect a Pi Cobbler.
However, there are situation where this should be quite usefull.
PiFace (that can be programmed under Python) uses SPI interface and I would like to use the I2C bus under Python (for AdaFruit LedBackPack, or AdaFruit LCD + Keypad).
This should be possible (from programming perspective)... but the issue in on the connector which does not allow to connect something + a Cobbler.
Note: the PiFace connector is already soldered... so no way to remove it and replace it :-(
Does anyone has an affordable idea?