I discovered something new - hadn't seen it discussed, though I don't follow the thread regularly. I did read the first few posts and the last eight or so pages.
The rule (insofar as I was aware) is no overlapping FPs. However, I discovered a small loophole of limited usefulness. Once you have redeemed a FP+, you can move your next reservation into that time slot.
Example: we had an 8:30A Everest, 9:30A Dino, and 10:30A Primeval Whirl. We did Safari at rope drop, hit Everest around 9 and made it to Dino about 9:25. Waited for that window to open, and then as soon as we tapped our bands at the checkpoint, I went to the app and was able to move PW to 9:55.
It was around 9:40 at this time, so we were able to go to PW immediately upon finishing, and were leaving the park by 10:20 (instead of standing around waiting for our window to open.)
Obviously this will only work with lower-level FPs that are likely to have immediate availability, but it saved us a good 45m of waiting around. (We also looked at making a similar change at DHS one night so it's a repeatable phenomenon.)
Is this a known feature?