Bruce and Dave,
You both know more than I do without a doubt but FAPE does make big changes. I played with it in my car, accidently too much, and I could barely go up a hill, with it as little as 10%. Car would lay down, puke black smoke etc. I'd haveta let off, let PE clear, then start over, or let off and plant it WOT to make it up a hill. So I haveta assume it makes all calcs, then apply's FAPE.
As for using it in the 1/4, I haveta beg to differ. If it is used for IC soak then it apply's, if it is used as a cooldown, then it applys.
My reasoning, and I've Used it for this is this:
You make a pass. If you watch O2, (lets use it for arguements sake as I know you hate using the NB sensor Bruce) they tend to be a little fat early and lean out as you make your pass. Is it enuf to hurt anything? Probably not, but I've used it and not used it and have gained by using it. I can and will send you a bin I did in Bristol for my pal Rich, I dont think I have a DS file saved before uising FAPE, but suffice to say when I used the PE/RPM trims to keep the car from leaning out at the big end. This hurt spool in his car. Disclaimer: May not happen in all cars as we all know, different cars like different things ANYWAY, I leaned out PE/RPM to where the car pulled at the start, and it'd start leaning out around top of 2nd, or bottom of 3rd. I dunno, 6-7 seconds into the run? I started playing with adding small amounts, I think I wound up at .8 (1.08 or something like that, I'd haveta look to see what the exact value was) to get the the O2's back up to where I wanted them. All this (or this little change, whatever you want to call it) resulted in a run that started at .800 and went ALL THE WAY DOWN THE TRACK at .776 to .779. Totally flat line. That resulted in his best time, and pulled the wheel on his launch. (1.55 60' on ET Streets) I dont think the car ever ran like that before. That chip, with some further playing has gotten down to 11.48 on his last time to the track. As you know, 5500rpm in first may be fine, but 5500 in 3rd might be lean, maybe its Bruces IC saturation theory, I dunno.
So my point is FAPE Can be used as a positive tuning tool. I cant understand how PE/TPS would do anything as you're at 88%-100% all the way down the track, unless you're peddling it. Just gotta be conservative when using it cuz in MY car, a small change made a BIG difference.
Thats my $0.00000002 (probably all its worth)