Any way to drive the Stat LED on the RIO?

Is there a way to drive the Stat light on the RIO - to blink it, turn it on/off, or purple?

No.

EDIT 20 hours later… I had to talk to the hardware guys to get the details, but long story short, the Stat LED - actually most of the LED on both RIO and EPIC - are not driven by Linux kernel addressable I/O. We show the status of the hardware before it boots. To do this, we control the LED by other means.
Which means the end user can not take control of it.