You do not have to run your efi closed loop at idle. I would not want my combo setup to run closed loop at idle or during initial warm-up.
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How many of you fans of the 'well-tuned' carb have ever put a wideband in your car to see your carb's tuning? I'm betting DaytonaTurbo and only a few others in this thread have done that. 
Yes I did put a wideband to my thermoquad. I was surprised at how lean I was running at cruise, and the motor did not seem to mind at all. As for cold start-up and cold driveability, I had more luck spending a cool morning tweaking the choke linkage to get the choke door where I wanted it. Shockingly enough, the factory recommendation was a great place to start!
