Simpler initiative tracking. Everyone rolls like normal, but then I call out “anyone higher than X”, X being what I rolled. So players have a bit more flexibility, and I don’t have to waste time going down all of the numbers. Then I go, then I call out everyone else can go.
I do this too. I also roll initiative this way every round. It really streamlines combat and makes things a lot more tense.
Long rests not allowed in the dungeon.
Long rests are 24 hours and require a successful survival check in the wilderness.
Magic item charges use the Usage Die from The Black Hack.
I don't use feats, but I grant a lot of feat abilities as normal defaults. For example, all proficient characters can use the additional attack on a crit or drop to 0 from Great Weapon Mastery. All characters who can fight on horseback get the advantage on attacks from Mounted Combatant and all characters get the Polearm Master opportunity attack.
If you benefit from a Raise Dead or Revify or such, you gain a permanent and cumulative -1 to all your future death saves.
If you drop to 0 hit points, you suffer a cumulative level of Exhaustion