I had my MAS disconnected many time with engine running or not running but I never had problem with CC doing that. If I disconnect MAF with engine running idle speed would not change but when I connect it back idle will drop to like 100rpm and then raise back to normal 550 or so.
I can't help you with your problem but I thought that I should type some of my experience with connecting and disconnecting things. Isn't one of ETA functions to work as CC actuator?

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1999 ML430 Silver 135k ml
Smoked LED taillights, Alpine in-dash DVD player, 12" sub, Pioneer components, 2 amps, 4200k HIDs, ML55 headlights, 20" rims, mirror LED blinkers

SOLD. 1996 E320 145k ml. Burgundy

SOLD but miss it everyday 1992 500sel Black
Chime buzzer mod,Alpine CD/MP3 player with stock amp,Euro headlights,S600 grill,20" rims, BEST CAR EVER!

SOLD. 1990 300E White
187k ml,smoked tails,Euro headlights,17rims,Intake,12" sub in first aid kit,alarm/autostart,buzzer mod