When I had jumping idle speed problems, the advice I was given from a seperate thread here, was to warm the engine, undo the battery, or the fuse for the ecu, for about a minute or so, start the car, straight to 2000 rpm for 10 or 30 seconds, ( I forget which it was), and lo and behold, my idle speed has been perfect ever since. that was over a year ago now.
I don't believe you have to do anything else (apart from stock radio codes) when removing the battery. It would be bullshit and a big backlash at Holden if you did.
The ecu should have it's own (excuse the incorrect computer jargon here) permanently written info in the electronic side of things. And it stores it there for good.
If you pull the plug on a home computer, it won't lose any info, even if you take the little motherboard battery out, or if it does, it knows how to reset everything. Same with a car.