Yeah, I know. I tried the built-in gyro some time ago. Not the most sensitive one, it might struggle with balancing a fast drone, but perfectly enough to detect a walk or balancing a single wheel.
With 101 the Intel Curie processor is not exposing a slave mode on I2C to the external world at all. I can't find the thread I read about that but found this:
https://forum.arduino.cc/index.php?topic=375503.0
Regards,
radoval