I'm aware of the Off @ Idle status of the factory ECU, I can only think that this may have been to prolong the life of the VCT solenoid by not having it switch on as much... I have not found any difference in drivability or idle.
We don't connect the VCT input of the BC (don't have a manual in front of me), simply use the output, through a changeover relay, to the VCT on the 33 loom... I can't remember as we now map the 33 ecu and haven't done this for a while...
If you hook the buddy club up to power, earth, and rpm, you can check the output (I think it provides a switched 12V output?) and use that through a changover relay to the required output (earth?) is on with ignition, and off at set rpm??
I can verify when I'm back in Melbourne next week and check my diagrams, just in Virgin Lounge at Melbourne airport on my way to Darwin to tune some cars.... mmm Hot Sweaty weather yay (not!)
Hope this helps...
Sam