I've just done this on a customers car today with the new cam we have installed. Timing during idle transition was dipping into the 12's on the base and main spark map.
Thru in 20 degrees at the 400 & 800 rpm at loads up to 0.52 and no more stalling
Mike
"For example, the stock main spark table has 19, 22, and 27 degrees of advance for 400, 600, and 800 rpm. So when you're rolling at 5 mph and the rpms dip, the lower the rpms get, the lower your timing gets. Change it to 35, 30, 25 and like magic no more dipping. Bonus: you shouldn't even need to change your idle airflow tables if you only change the timing at rpms below your idle speed.
Cliff notes: more timing below idle rpm in main and base spark tables