Being able to retroactively bring back that drow PC I killed early on because no one told me I could befriend her, and even then it was before they opened her up to good runs
being able to get that mark of the whatever, which I missed, so I can maximize my use of those dexterity gloves
going to the level 20 cap
Better haste spells, I haven’t played in months but I remember the spells being entirely different than what I’m used to hearing in 5E, and they sometimes glitch and stun you early
being able to resurrect NPCs that just died in battle
more notable D&D loot, even possibly things from CR or other sources.
I can’t wait for;
You should take a look at the mods that already exist. Pretty sure some of what you listed is already available.