Razor 9DOF IMU + Bluetooth + Pushbutton

Hello,

I've got a hardware setup and question very similar to the one posted by user amundsen, on November of 2011.

In my setup I've a Bluetooth Mate Gold connected to the TX/RX of the IMU, but find myself needing to incorporate a pushbutton to the hardware. There are no GPIO jumper-ports on the Razor, the TX/RX lines are taken---can I use the MOSI/MISO ports in some way to make this happen?

This is part of an urgent project, any and all help is appreciated. Thank you in advance.

Did you have an Arduino question?