couple questions regarding 2.4 cavalier

a buddy of mine wants his 2.4 cavalier so I've been looking over stock files to get a feel. Most of my experience is with LS and 3800 engines. I have a couple questions if you don't mind.

1. when does the computer use double fire injection vs single fire injection? so I see, the computer uses singel fire from the factory. Any advantages to running double fire? From what I've read so far there isn't.
2. what aproximate timing/ af ratio should I shoot for during wot on a near stock engine? a/f looks to be 13.0 and timing well into the 20's. Can't imagine there is much to be gained on a stock vehicle.
3. the pe vs map vs rpm table starts at 120 map...this engine is not yet boosted so It will see between 90-100 map at wot. Will it just use the 120 column? I'm assuming that's the case.

any help is appreciated.

Really? Nobody?

12.5 is rich side n/a and 13 is lean side
12.7 is a good number I use for factory parts keeps it a tad cooler than 13

These are general values for n/a vehicles.

Those ratios are a bit general, I was hoping for a more specific answer since most engines have a ideal ratio