I have gotten from Wayne at Tuneboy the definition for the different map tabs in the advanced user view of the new version of TunEdit.
F1, F2, F3 are the throttle based fuel maps for each cylinder used by the ECU when the Throttle Position Sensor reads above 12%.
L1, L2, L3 are the MAP sensor based fuel maps for each cylinder. They are used when the throttle opening is below 6% and the values are in millibars.
When the throttle is between 6% and 12 % it "ramps" from using MAP to TPS.
I1, I2, I3, I4, are I1= neutral ignition map, I2= 1st gear ignition map, I3, 2nd gear ignition map, I4= 3rd-5th ignition map.
I know, this doesn't mean much now, however hopefully down the road it will come in handy for those interested in TuneBoy.