Probably 4 moves:
Generated By csTimer on 2020-01-20
128. 1.161 F2 U R2 U' R2 F2 R2 U' F' @2019-10-20 21:27:40
But I don't bother tracking PB singles for 222 because that's just silly.
With the Valk Elite's interchangeable centre magnets, the pull will be the same for all of the faces if you mix magnet strengths in the way u Cube was asking about.
You do have a point that it's theoretically possible to feel a difference in magnet strength between the centres and edges, but...
… Which is not a sphere, yes.
There have been quite a few puzzles where tiles can be moved in a loop:
(and a whole bunch more; you can see the whole list on Jaap's Puzzle Page)
However, these don't have...
The forced multislotting thing (#1) seems to be very situational; I usually prefer to just solve the partial slot with keyhole first, then deal with the last slot on its own. It's certainly useful for the scenarios where keyhole can't be used, though! (E.g. the missing piece is in the wrong...
Literally just "ar" and "three ar" / "four ar" etc. There's basically no risk of confusion, although if disambiguation is really necessary, I'd probably say "ar wide", "three ar wide", etc. for the wide moves and "two ar", "three ar" for the slice moves. Basically, just reading SiGN / WCA...
It comes with magnets already installed and you can't change them. (I hear it's very difficult to remove the caps on the pieces and you risk damaging the puzzle permanently if you do that; it also seems that there's no room to add magnets anyway.)
L2C: Make a 2×3 block on the left side of the front face, then spam Rw and U moves until you solve the last bar. The "Sunes" (Rw U Rw' U Rw U2 Rw' and Rw U' Rw' U' Rw U2 Rw') are useful to deal with cases where there's only one x-centre (a corner-centre) left to fix.
L2E: Learn one of the...
On one hand, gender is irrelevant here. On the other hand, of all other popular speedsolving methods are named after the inventors: Roux is named after… Gilles Roux (I don't know whether he called it the "Roux method" himself originally, but it's the name we all use now) and "ZZ" is the initials...