I figured I should have a place to publicly post my various mod requests that would improve the gameplay. I'll update the OP as I remember certain features, so check back if these interest you.

1. Rotate small objects with the keypad while moving them
Desperately needed for house decoration. It's hard to place a skull properly on your bedside desk, you know?

2. Multiple quick-key selections
Needed to equip more than one thing per key. Are you being social or sneaky? Then equip all sneak apparel with a button. Magic or Melee? Equip both magics, both weapons, sword and shield, and the respective amulets.

3. Map notes
To keep track of flora/fauna/places not marked. Hover over them to read.

4. Journal
Something like Neverwinter Nights, but if it needs to be a book, be sure there's no huge letters or flipping through pages slowly.
Unless you can have multiple, nameable journals w/ different covers, give it a index of sorts with a "New Index" option to flip right where you want to be.

5. Speed up book pages
Self-explanatory.

6. Create a Morrowind-style dialog system for other modders to use.
To make quest creation/new characters easy to do.

7. The ability to change your companion's armor/weapons.
Might be doable by assigning a key to use when in their inventory, with indicators similar to your own equipped items.
edit: Okay, they'll use the most powerful weapons you give them. Dunno about armor.

8. A hotbar, used in conjunction with suggestion #2
Shows all the items equipped when the quick-keys are pressed. Uses the same font as the arrow type used when shooting a bow.

9. When storing items, double tap R to store the entire stack.
Having to switch between R and E for the quantity selection causes the player to make mistakes between storing items and accidentally using a separate item.

10. hardcoe mode
Only one save, based on the character. Dying uses an autosave for the last map you entered.

11. Wield a bow while riding a horse.

I don't think I'm going to put too much content addition on this list because they'll come on their own. Jewelry, Armor, etc. One thing I'm concerned about is modding NPC dialog; Morrowind's text system was the best for content creation, and the move to voices seems to be a real hindrence in this area, and I'm hesitant about adding requests for extra dialog options. The stewards are the first thing that comes to mind as viable content additions, since all you need to do is add text to your house addition request & re-use the standard "it has been done" line.

I like making gifs and things so I made this for suggestion #8 to flesh out the idea. The icons could be smaller & better but it's a rough workup:

http://k.minus.com/isdnnjfqjcMoT.gif

What do you think?

This is turning into a "What Skyrim should have been launched with" list