Actually nothing about the IMRC will surprise me.
I can tell you exactly how they act at any time or rpm or even throttle position if you ask.
I also think that having a "light" to tell you they are open is "bling, bling" silly!
If you were actually going to use this information for tuning or anything related to performance or tuning or etc...
I would just tell you to datalog it with Alex Pepper's OBD-II setup since it's one of the countless features available with Manufacturer's Enhanced Login.
This way you can plot the IMRC activation in real time against any other data points you would like (Which I have done ad nauseam) instead of watching another silly light on the dash board.
