1o suggestion - Combination Class
This idea appeared sometime ago in my head, i didnt see this implemented in any MMO.
For example if the game got this classes.
Warrior, Thief, Mage, Priest/White Mage, Necromancer.
Maybe the classes are different, maybe it is more classes in this game, what i want to say is only a example to understand better what i want to tell.
Any player could pick some of this class in the begining of the game, where it could be called a minor class slot 1.
With actions of the player in the game he could get the second minor class (slot 2) where could get by reading books (for magic), learn more about carrying armor and how to use it better, training more the skill of the wepon, training more the skill of the shield, training more the skill of magic (healing, destruction or Alteration). Training more assassin skill and Thief skill.
That actions could be get with combats, killing innocent npc (that kind of npcs is the ones who walk around the world and dont sell/buy items, dont have any interaction with any quest in the game, that kind of npcs could be killable and if the player kill them or steal anything from them will increse the skill of assassination or thief).
minor class (slot 1) + minor class (slot 2) = major class
2 minor classes = 1 major class
For example if i pick Warrior in the begining of the game and i go to some church read some holy book, i could turn into a sanctified person, where i increase healing spells that makes me a priest but in warrior, where it could make me a sanctified warrior or paladin.
Warrior + Priest = Sanctified Warrior
This major class got 3 skills of warrior class and 3 skills of priest class.
If the player want to remove the minor class slot 2 then he should search for an npc in each city where are hide in some sewers or something, that npc require gold to remove the second minor class, if the player do that, then the player can get another minor class for slot 2 and make another combination. If the player remove the second class then will lose the 3 skills that second class could give, If he got a new second minor class then he will receive new 3 skills of that minor class.
That could make more variety of major/minor classes and it could get a custumization by the actions that player takes.
2o suggestion - Hero tilte
That is a bit different, i dont know what is the preference of the required quest to that, i dont know if it is better being a daily quests, or weekly or monthly.
Ok, there we go.
This could be some title that player could get by doing some quest. That quest can be to save some town where bandits that are making the people of that town to hostages and u need to go to there and beat in all bandits to save the town, rescue some questgiver's friend from some beast or assassination group, deliver some message to some npc in another point of the world, well that can be alot quests randomized and some sequence by what the player did before. That is generated in some npc. Since cyrodill is a map where every1 go to pvp, then that questgiver could be situated in cyrodill where everytime he spawns in randomized point of the map. Let assume that quest is a daily quest.
That npc spawns in this time for example 13:00 to 16:00 in some randomized point in cyrodill. The player should find him and complete the quest as fast as possible, since he will do a competition with other player in same faction and others factions, since he acept the quest. I assume that servers will have thousands playing there, so i will make this challenged, only 100-200 players should have that title in 1 day. I mean if the server reach the number of players that have the hero title to 100-200 then the npc wont give any quest anymore in that day for every1 until he dissapears (16:00 pm). Why all of this, because if the player wants to be unique and wants to be a hero need to go there fight, be smart and faster than others players.
Another thing is, for example, if I receive that title today and if tomorrow i wont do the daily to still have the title then i will loose it for another player who did the quest. Only 100-200 players should have the titile in 1 server and in 1 day, if u wont do that daily in the next day then u will lose the title for who did it.
If all this will be in a pvp map then players who are pve and want to do this daily then they will need to go to that map.
Ah, attention, everytime u do the daily u receive some reward, gold, mount, enchant, piece for craft items and more...
3o suggestion - make able to people buy house like in skyrim
I have some idea, every city should have 3 houses, the best house cost more gold and for towns should have only 1. After the player buy the house the house turn in instance with the ID. That ID should be only for that player and that ID wont reset. Others players can enter in my house for example if i invite them for a group and i am the leader, then they can visit my space. To make this some more realistic in MMO version

4o suggestion - How to craft items.
We could have a ebony gear and draedric gear, weapons and other things right?
For example if i want to make a dwarf gear then i should go with my friends to some dungeon/raid where involve dwarfs, in that instance the mobs/boss, chest and other things drop me the metal made by dwarfs, or leather, or cloth, etc... The boss usally drops some pearls, where it is rare to drop. Or very rare to make this more challenged.
And to make a chest armor i need to have for example:
x20 dwarfs metals
x10 big pearls
x8 Dwarven ignots
This is only a example, but i didnt formulate very well this idea, but when i have better idea for this i will post.
Give me ur opinions please, lets help them, as a big fans of Elder Scrolls.