1. Skins for abilities and skill lines
What I basically mean by this is that ZOS should implement what they did with the grey-bear for warden to other classes in the game, so instead of adding some strange necromancer class to the game players could get skins for the daedric summoning skill line so that they can replace the storm atronach with a giant skeleton atronach instead, but its only a skill change so it will function the same but look different. Other Abilities I could see being re skinned would summon familier being turned into a skeleton and shadow image having it so that instead of just phasing into back into your previous position you turn into crows/butterfly which fly back to your previous position and reform you, kind of like Itachi's ability. Another idea I had is that this would make it so you could become other were beasts like there are in elder scrolls lore, such as wereboar, the abilities would function the same but would look different to preserve immersion. I feel like this would help add more diversity to the game making each character feel more unique while not making the game too complex so that it would overwhelm players.

2.No more skill points
I would LOVE to see the removal skill points in the game, especially for things like passives and crafting. Now what I'm saying has a perfectly reasonable base. Being Level 50 in something means that you are essentially a master at it, so therefore it makes no sense to keep skill points. Like does this make any sense to you.

Player 1: "I am a MASTER (Level 50) Blacksmith."
Player 2: "So does that mean you can make me this pretty simple rubidite axe for me?"
Player 1: "No, even though I'm a Master blacksmith I haven't absorbed enough crystals to make anything."
Player 2: "How is that related in anyway to blacksmithing?"
Player 1: "No Clue, ZoS logic."

Like it makes no sense that you are a master shadow user but can't use a basic shadow ability because you don't have a skill point, like leveling a skill line should automatically unlock skills and passives for you.

Also another thing related to this: We should be able to unlock both morphs of an ability at the same time but only one slotted at one time.

3. Top Down House Eidtor
I really don't know if this is possible with the game engine or how it would impact the frame rate and whatnot. This is just an idea in the air but I would love to see a top down style editor this would seriously help with lining tables and shelves against walls properly and rugs and pretty much everything except for stuff that goes on walls. It could be like a level/floor type editor so you select which floor you want to edit and then it gives you and editor for that floor so you can place stuff around on the floor.

4. Climbing / Diving
I would love the ability to dive and climb in the game. I understand that this would be insanely hard to implement since you would have to change pretty much the entire world map so that players could climb. However, Diving doesn't seem like it would be too hard. You could make it so that Climbing and Diving Drains Stamina so that players couldn't endlessly climb and dive, and steep/deep the platform the more the stamina drain accelerates.

Thanks for taking the time to read this

EDIT: I realized that there would be a bunch of useless skyshards lying around the entire map so maybe you could re-purpose them so that they give you something like more enlightenment or a exp boost for 30 min or something along the lines of that.