Attunement - Players can use 1 action to attune, but must wait an hour after de-attuning before using that attune slot again (so no effect if you only have 1 or 2 items attuned so far)
Wands - Non-spell wands (i.e. Wand of Secrets) can be used by anyone they are attuned to.
Scrolls - All classes may attempt to use a scroll, DC10+spell level. The ability used is either their spellcasting ability (if they have one) or Intelligence (Arcana) for arcane scrolls, Wisdom (Religion) for divine, or Wisdom (Nature) for primal.
Inspiration - All players receive inspiration token at the beginning of session. After used, inspiration can be gained again through normal means (role playing, humor, general bad-assery).
Proposed (but not yet) rules:
Critical Strikes - Perkins rule: max first die, then roll double dice (so e.g.: Longsword, instead of 1d8+Str normal / 2d8+Str crit, is now 8+2d8+Str for crit).