Remathilis
Legend
You missed:
• Variant Entertainer: Gladiator (PHB 131)
• Level advancement without XP (DMG 261)
o Session-Based Advancement (DMG 261)
o Story-Based Advancement (DMG 261)
Agreed impressive list.
Though many of these I would not consider a dial or lever like emdw45 says. For example the planar traits and many of the monster manual options and variants.
Thanks for finding more. Again, doing it by hand means you do miss things skimming through. (I can't believe I forgot gladiator!)
And I debated including the planar traits and most monster variants. Only did so because they are options DMs can turn on/off (for example, a DM who doesn't care about the planes much might not want to worry about those traits; a Planescape DM will live-or-die by them.)