I’ve tried it, with the same Result. I would also say this is a Bug. IPO-Play and Action-Flipper works correct. You should write this into the BugTracker.
And i think i found a second Bug on this Actuator. The Flipper Mode does not work proper:
Use a Keyboard Sensor to pulse the Actuator.
Hit the Key and the Armature is fading to the EndFrame.
Release the Key and the Armature is fading back to the StartFrame.
Hit the Key again, before it arrives the StartFrame, it should fade from the current Frame to the End. But now, it jumps to the StartFrame and starts a new Animation from the Beginning.
This works ok with IPO-Flipper. Cand anybody confirm this?