Hi,
To get the speed of any value changing over time is simply a matter of getting the delta change on each frame and divide it by the delta time.
so, have a fsm that gets the delta rotation ( the current rotation - the last one), and also get the deltatime ( using the action "getTimeinfo"), your rotation speed with be Delta rotation/delta time.
Try to play around with this, meanwhile, I'll see if I can do a custom action to do that tomorrow. Please bump this next week if you haven't heard back. a bit pressed at the moment
bye,
Jean