Re your PA1 to PA2 and back question, the answer is yes.
Presets to footswitches is not something I personally use a lot, but I DO use it on occasion. We have a few songs in our set that segue from one into the other, and the ability to get to the next Preset in my setlist ASAP is useful in that context! It also ensures that while I rush to change I don't screw up.
Most of the time I have something like
S1 S2 S3 S4
Drive Delay Reverb Wildcard
Sometimes the wildcard is the next Preset, sometimes it's a mute, sometimes it's another effect. Sometimes I have more than 4 scenes and then scenes end up on row 2.
It's just about having the options... even if you never ever use them.
Oh and thanks for the kind words about the video!