Expanding Classes, adding new abilties to the existing classes and adding other skillines.

Thevampirenight

Point, is this game does not have that many abilties, and the ones that people would like to get their hands on are not useable by players.
Point is, they need to expand class abilties.
Sorcerer

Sorcerer, needs more daedra summons, fire attronoch, Frost Atronoch.
They need to expand the third tier of sorcerer, renaming it from Lightning to Elemental Magic.
In addition to having lightning spells they would have fire and frost spells as well.

Templar

Templar, in addition to the three trees it has, could have expanded abilties, like turn undead, making vampires bane really do extra damage to vampires. Adding abilties that count as blessings, basically adding a blessing of Akatosh, Mara, Stendarr, Dibella, and Arkay which gives group buffs, useful ones.

Nightblade

Nightblades, should get another skill line Witchcraft Which gives abilties like summoningg crows and Ravens, that act like shrouds to maybe shape changing into a raven which flies but only up to where you charaters head would be, giving you 100 precent dodge chance for 5 seconds, this would be the ult, finallly they add a turn to ravens abilty that acts like the sorcs escape bolt skill

DragonKnight

I do think they need to add more earthen heart abilties Ice armor, icy mist Icy shard, and freeze. Also they need to add ice versions of the ardent flame abilties, Icy breath, Whip of ice, Ice storm, and icy Chains. Basically Dragonknight should have Fire,lava and Ice abilties

Abilties that should Learnable in game from certain quests.
Necromancy

Abilities- Summoning Flesh Attronach Summoning zombies out of the ground, raising a dead foe to temp fight for you, but not bosses. Summoning Skelitons.

Wyrress Magic

Abilities-Transform into a normal looking wolf, summoning roots to bind a foe to place for a few seconds, a nature shield that protects you. Summoning sprigens as pet summons, calming animals making them fight for you.maybe an earthen armor where you become looking like your made of dirt and grass and roots.
Weapon Skill lines

Hand to hand/Acrobatics skill line

Adding abilties that allow you to be more like a monk and this skilline would increase hand to hand damage. Making it worth it to just go with your fists like a monk.